diff --git a/keyserver/src/uploads/uploads.js b/keyserver/src/uploads/uploads.js
--- a/keyserver/src/uploads/uploads.js
+++ b/keyserver/src/uploads/uploads.js
@@ -9,10 +9,11 @@
 import {
   type UploadMediaMetadataRequest,
   type UploadMultimediaResult,
-  uploadMultimediaResultValidator,
   type UploadDeletionRequest,
   type Dimensions,
+  type MultimediaUploadResult,
 } from 'lib/types/media-types.js';
+import { MultimediaUploadResultValidator } from 'lib/types/validators/upload-validators.js';
 import { ServerError } from 'lib/utils/errors.js';
 import { tShape, tID } from 'lib/utils/validation-utils.js';
 
@@ -32,13 +33,6 @@
 const upload = multer();
 const multerProcessor: Middleware<> = upload.array('multimedia');
 
-type MultimediaUploadResult = {
-  results: UploadMultimediaResult[],
-};
-const MultimediaUploadResultValidator = tShape<MultimediaUploadResult>({
-  results: t.list(uploadMultimediaResultValidator),
-});
-
 async function multimediaUploadResponder(
   viewer: Viewer,
   req: MulterRequest,
diff --git a/lib/types/media-types.js b/lib/types/media-types.js
--- a/lib/types/media-types.js
+++ b/lib/types/media-types.js
@@ -817,3 +817,7 @@
   encryptedImageValidator,
   encryptedVideoValidator,
 ]);
+
+export type MultimediaUploadResult = {
+  results: UploadMultimediaResult[],
+};
diff --git a/lib/types/validators/upload-validators.js b/lib/types/validators/upload-validators.js
new file mode 100644
--- /dev/null
+++ b/lib/types/validators/upload-validators.js
@@ -0,0 +1,12 @@
+// @flow
+
+import t, { type TInterface } from 'tcomb';
+
+import { tShape } from '../../utils/validation-utils.js';
+import { uploadMultimediaResultValidator } from '../media-types.js';
+import { type MultimediaUploadResult } from '../media-types.js';
+
+export const MultimediaUploadResultValidator: TInterface<MultimediaUploadResult> =
+  tShape<MultimediaUploadResult>({
+    results: t.list(uploadMultimediaResultValidator),
+  });