diff --git a/js/modules/types/visual_attachment.js b/js/modules/types/visual_attachment.js
index 3246e6d5a..955d1b9d6 100644
--- a/js/modules/types/visual_attachment.js
+++ b/js/modules/types/visual_attachment.js
@@ -98,33 +98,41 @@ exports.makeVideoScreenshot = ({
 
     video.addEventListener('canplay', capture);
     video.addEventListener('error', error => {
-      logger.error('makeVideoThumbnail error', toLogFormat(error));
+      logger.error('makeVideoScreenshot error', toLogFormat(error));
       reject(error);
     });
 
     video.src = objectUrl;
   });
 
-exports.makeVideoThumbnail = async ({ size, videoObjectUrl, logger }) => {
+exports.makeVideoThumbnail = async ({
+  size,
+  videoObjectUrl,
+  logger,
+  contentType,
+}) => {
   let screenshotObjectUrl;
   try {
-    const type = 'image/png';
     const blob = await exports.makeVideoScreenshot({
       objectUrl: videoObjectUrl,
-      contentType: type,
+      contentType,
       logger,
     });
     const data = await blobToArrayBuffer(blob);
     screenshotObjectUrl = arrayBufferToObjectURL({
       data,
-      type,
+      type: contentType,
     });
 
-    return exports.makeImageThumbnail({
+    // We need to wait for this, otherwise the finally below will run first
+    const resultBlob = await exports.makeImageThumbnail({
       size,
       objectUrl: screenshotObjectUrl,
+      contentType,
       logger,
     });
+
+    return resultBlob;
   } finally {
     exports.revokeObjectUrl(screenshotObjectUrl);
   }
diff --git a/js/views/file_input_view.js b/js/views/file_input_view.js
index 1c3873848..76e023881 100644
--- a/js/views/file_input_view.js
+++ b/js/views/file_input_view.js
@@ -161,8 +161,9 @@
         // we use the variable on this here to ensure cleanup if we're interrupted
         this.previewObjectUrl = URL.createObjectURL(file);
         const type = 'image/png';
-        const thumbnail = await VisualAttachment.makeVideoScreenshot({
-          objectUrl: this.previewObjectUrl,
+        const thumbnail = await VisualAttachment.makeVideoThumbnail({
+          size: 100,
+          videoObjectUrl: this.previewObjectUrl,
           contentType: type,
           logger: window.log,
         });
@@ -171,7 +172,7 @@
         const data = await VisualAttachment.blobToArrayBuffer(thumbnail);
         this.previewObjectUrl = Signal.Util.arrayBufferToObjectURL({
           data,
-          type: 'image/png',
+          type,
         });
         this.addThumb(this.previewObjectUrl, { addPlayIcon: true });
       };