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
@@ -59,6 +59,7 @@
   NativeMediaSelection,
   MediaMissionResult,
   MediaMission,
+  MediaMissionStep,
 } from 'lib/types/media-types.js';
 import { messageTypes } from 'lib/types/message-types-enum.js';
 import {
@@ -728,7 +729,7 @@
     const { ids, selection } = uploadFileInput;
     const { localMediaID } = ids;
     const start = selection.sendTime;
-    const steps = [selection];
+    const steps: Array<MediaMissionStep> = [selection];
     let encryptionSteps = [];
     let serverID;
     let userTime;
diff --git a/native/media/blob-utils.js b/native/media/blob-utils.js
--- a/native/media/blob-utils.js
+++ b/native/media/blob-utils.js
@@ -72,7 +72,7 @@
   result: MediaMissionFailure | FetchBlobResult,
 }> {
   const uri = getFetchableURI(inputURI);
-  const steps = [];
+  const steps: Array<MediaMissionStep> = [];
 
   let blob, fetchExceptionMessage;
   const fetchStart = Date.now();
diff --git a/native/media/encryption-utils.js b/native/media/encryption-utils.js
--- a/native/media/encryption-utils.js
+++ b/native/media/encryption-utils.js
@@ -179,7 +179,7 @@
     'encryptMedia should only be called on unencrypted photos and videos',
   );
   const { uploadURI } = preprocessedMedia;
-  const steps = [];
+  const steps: Array<MediaMissionStep> = [];
 
   // Encrypt the media file
   const { steps: encryptionSteps, result: encryptionResult } =
diff --git a/native/media/file-utils.js b/native/media/file-utils.js
--- a/native/media/file-utils.js
+++ b/native/media/file-utils.js
@@ -56,7 +56,7 @@
   result: MediaMissionFailure | FetchFileInfoResult,
 }> {
   const { mediaNativeID } = optionalInputs;
-  const steps = [];
+  const steps: Array<MediaMissionStep> = [];
 
   let assetInfoPromise, assetURI;
   const inputPath = pathFromURI(inputURI);
diff --git a/native/media/image-utils.js b/native/media/image-utils.js
--- a/native/media/image-utils.js
+++ b/native/media/image-utils.js
@@ -30,7 +30,7 @@
   steps: $ReadOnlyArray<MediaMissionStep>,
   result: MediaMissionFailure | ProcessImageResponse,
 }> {
-  const steps = [];
+  const steps: Array<MediaMissionStep> = [];
   let { uri, dimensions, mime } = input;
 
   const { fileSize, orientation } = input;
diff --git a/native/media/media-utils.js b/native/media/media-utils.js
--- a/native/media/media-utils.js
+++ b/native/media/media-utils.js
@@ -139,7 +139,7 @@
     }
   };
 
-  const steps = [],
+  const steps: Array<MediaMissionStep> = [],
     completeBeforeFinish = [];
   const finish = async (failure?: MediaMissionFailure) => {
     if (!resultReturned) {
diff --git a/native/media/save-media.js b/native/media/save-media.js
--- a/native/media/save-media.js
+++ b/native/media/save-media.js
@@ -64,7 +64,9 @@
       },
     ) => {
       const start = Date.now();
-      const steps = [{ step: 'save_media', uri, time: start }];
+      const steps: Array<MediaMissionStep> = [
+        { step: 'save_media', uri, time: start },
+      ];
 
       const { resultPromise, reportPromise } = saveMedia(uri, 'request');
       const result = await resultPromise;
@@ -173,7 +175,7 @@
   permissions: Permissions,
   sendResult: (result: MediaMissionResult) => void,
 ): Promise<$ReadOnlyArray<MediaMissionStep>> {
-  const steps = [];
+  const steps: Array<MediaMissionStep> = [];
 
   let hasPermission = false,
     permissionCheckExceptionMessage;
@@ -277,7 +279,7 @@
   inputURI: string,
   sendResult: (result: MediaMissionResult) => void,
 ): Promise<$ReadOnlyArray<MediaMissionStep>> {
-  const steps = [];
+  const steps: Array<MediaMissionStep> = [];
 
   let uri = inputURI;
   let tempFile;
@@ -348,7 +350,7 @@
   inputURI: string,
   directory: string, // should end with a /
 ): Promise<IntermediateSaveResult> {
-  const steps = [];
+  const steps: Array<MediaMissionStep> = [];
 
   const { result: fetchBlobResult, steps: fetchBlobSteps } = await fetchBlob(
     inputURI,
@@ -397,7 +399,7 @@
   directory: string, // should end with a /
   inputMIME: ?string,
 ): Promise<IntermediateSaveResult> {
-  const steps = [];
+  const steps: Array<MediaMissionStep> = [];
 
   const path = pathFromURI(localURI);
   if (!path) {
diff --git a/native/media/video-utils.js b/native/media/video-utils.js
--- a/native/media/video-utils.js
+++ b/native/media/video-utils.js
@@ -58,7 +58,7 @@
   steps: $ReadOnlyArray<MediaMissionStep>,
   result: MediaMissionFailure | ProcessVideoResponse,
 }> {
-  const steps = [];
+  const steps: Array<MediaMissionStep> = [];
 
   const path = pathFromURI(input.uri);
   invariant(path, `could not extract path from ${input.uri}`);