diff --git a/lib/actions/upload-actions.js b/lib/actions/upload-actions.js
--- a/lib/actions/upload-actions.js
+++ b/lib/actions/upload-actions.js
@@ -9,7 +9,7 @@
 import { extractKeyserverIDFromID } from '../keyserver-conn/keyserver-call-utils.js';
 import { useKeyserverCall } from '../keyserver-conn/keyserver-call.js';
 import type { CallKeyserverEndpoint } from '../keyserver-conn/keyserver-conn-types.js';
-import { type UploadBlob } from '../keyserver-conn/upload-blob.js';
+import { type PerformHTTPMultipartUpload } from '../keyserver-conn/multipart-upload.js';
 import { IdentityClientContext } from '../shared/identity-client-context.js';
 import type { AuthMetadata } from '../shared/identity-client-context.js';
 import type { UploadMultimediaResult, Dimensions } from '../types/media-types';
@@ -28,7 +28,7 @@
 export type MultimediaUploadCallbacks = Partial<{
   +onProgress: (percent: number) => void,
   +abortHandler: (abort: () => void) => void,
-  +uploadBlob: UploadBlob,
+  +performHTTPMultipartUpload: PerformHTTPMultipartUpload,
   +blobServiceUploadHandler: BlobServiceUploadHandler,
   +timeout: ?number,
 }>;
@@ -52,7 +52,8 @@
   async (multimedia, extras, callbacks) => {
     const onProgress = callbacks && callbacks.onProgress;
     const abortHandler = callbacks && callbacks.abortHandler;
-    const uploadBlob = callbacks && callbacks.uploadBlob;
+    const performHTTPMultipartUpload =
+      callbacks && callbacks.performHTTPMultipartUpload;
 
     const stringExtras: { [string]: string } = {};
     if (extras.height !== null && extras.height !== undefined) {
@@ -85,7 +86,9 @@
       {
         onProgress,
         abortHandler,
-        blobUpload: uploadBlob ? uploadBlob : true,
+        performHTTPMultipartUpload: performHTTPMultipartUpload
+          ? performHTTPMultipartUpload
+          : true,
       },
     );
     const [uploadResult] = response.results;
diff --git a/lib/keyserver-conn/call-single-keyserver-endpoint.js b/lib/keyserver-conn/call-single-keyserver-endpoint.js
--- a/lib/keyserver-conn/call-single-keyserver-endpoint.js
+++ b/lib/keyserver-conn/call-single-keyserver-endpoint.js
@@ -2,7 +2,10 @@
 
 import _isEqual from 'lodash/fp/isEqual.js';
 
-import { uploadBlob, type UploadBlob } from './upload-blob.js';
+import {
+  defaultPerformHTTPMultipartUpload,
+  type PerformHTTPMultipartUpload,
+} from './multipart-upload.js';
 import { updateLastCommunicatedPlatformDetailsActionType } from '../actions/device-actions.js';
 import { callSingleKeyserverEndpointTimeout } from '../shared/timeouts.js';
 import type { PlatformDetails } from '../types/device-types.js';
@@ -29,13 +32,14 @@
 import sleep from '../utils/sleep.js';
 
 export type CallSingleKeyserverEndpointOptions = Partial<{
-  // null timeout means no timeout, which is the default for uploadBlob
+  // null timeout means no timeout, which is the default for
+  // defaultPerformHTTPMultipartUpload
   +timeout: ?number, // in milliseconds
   // getResultInfo will be called right before callSingleKeyserverEndpoint
   // successfully resolves and includes additional information about the request
   +getResultInfo: (resultInfo: CallSingleKeyserverEndpointResultInfo) => mixed,
-  +blobUpload: boolean | UploadBlob,
-  // the rest (onProgress, abortHandler) only work with blobUpload
+  +performHTTPMultipartUpload: boolean | PerformHTTPMultipartUpload,
+  // onProgress and abortHandler only work with performHTTPMultipartUpload
   +onProgress: (percent: number) => void,
   // abortHandler will receive an abort function once the upload starts
   +abortHandler: (abort: () => void) => void,
@@ -132,12 +136,18 @@
   const url = resolvedURLPrefix ? `${resolvedURLPrefix}/${endpoint}` : endpoint;
 
   let json;
-  if (options && options.blobUpload) {
-    const uploadBlobCallback =
-      typeof options.blobUpload === 'function'
-        ? options.blobUpload
-        : uploadBlob;
-    json = await uploadBlobCallback(url, cookie, sessionID, input, options);
+  if (options && options.performHTTPMultipartUpload) {
+    const performHTTPMultipartUpload =
+      typeof options.performHTTPMultipartUpload === 'function'
+        ? options.performHTTPMultipartUpload
+        : defaultPerformHTTPMultipartUpload;
+    json = await performHTTPMultipartUpload(
+      url,
+      cookie,
+      sessionID,
+      input,
+      options,
+    );
   } else {
     const mergedData: RequestData = { input };
     mergedData.cookie = cookie ? cookie : null;
diff --git a/lib/keyserver-conn/upload-blob.js b/lib/keyserver-conn/multipart-upload.js
rename from lib/keyserver-conn/upload-blob.js
rename to lib/keyserver-conn/multipart-upload.js
--- a/lib/keyserver-conn/upload-blob.js
+++ b/lib/keyserver-conn/multipart-upload.js
@@ -9,7 +9,7 @@
 } from './call-single-keyserver-endpoint.js';
 import { getConfig } from '../utils/config.js';
 
-function uploadBlob(
+function defaultPerformHTTPMultipartUpload(
   url: string,
   cookie: ?string,
   sessionID: ?string,
@@ -111,6 +111,7 @@
   return responsePromise;
 }
 
-export type UploadBlob = typeof uploadBlob;
+export type PerformHTTPMultipartUpload =
+  typeof defaultPerformHTTPMultipartUpload;
 
-export { uploadBlob };
+export { defaultPerformHTTPMultipartUpload };
diff --git a/native/input/input-state-container.react.js b/native/input/input-state-container.react.js
--- a/native/input/input-state-container.react.js
+++ b/native/input/input-state-container.react.js
@@ -922,7 +922,7 @@
                 'uploading',
                 percent,
               ),
-            uploadBlob: this.uploadBlob,
+            performHTTPMultipartUpload: this.performHTTPMultipartUpload,
           },
         );
 
@@ -947,7 +947,7 @@
                 thumbHash: processedMedia.thumbHash,
               },
               {
-                uploadBlob: this.uploadBlob,
+                performHTTPMultipartUpload: this.performHTTPMultipartUpload,
               },
             );
           })();
@@ -1174,7 +1174,7 @@
     });
   }
 
-  uploadBlob = async (
+  performHTTPMultipartUpload = async (
     url: string,
     cookie: ?string,
     sessionID: ?string,
@@ -1188,14 +1188,14 @@
         input.multimedia.length === 1 &&
         input.multimedia[0] &&
         typeof input.multimedia[0] === 'object',
-      'InputStateContainer.uploadBlob sent incorrect input',
+      'InputStateContainer.performHTTPMultipartUpload sent incorrect input',
     );
     const { uri, name, type } = input.multimedia[0];
     invariant(
       typeof uri === 'string' &&
         typeof name === 'string' &&
         typeof type === 'string',
-      'InputStateContainer.uploadBlob sent incorrect input',
+      'InputStateContainer.performHTTPMultipartUpload sent incorrect input',
     );
 
     const parameters: { [key: string]: mixed } = {};
@@ -1214,7 +1214,8 @@
       const value = input[key];
       invariant(
         typeof value === 'string',
-        'blobUpload calls can only handle string values for non-multimedia keys',
+        'performHTTPMultipartUpload calls can only handle string values for ' +
+          'non-multimedia keys',
       );
       parameters[key] = value;
     }