MastoHttpError: Error processing thumbnail for uploaded media

[individual8]

I stumbled into another error that is unresolved. It seems like Mastodon cannot swallow my image upload.

Here's my code:

try {
    // upload media
    const photo = await fetch(mediaUrl + '=w1500-h1500');
    const thumbnail = await fetch(mediaUrl + '=w750-h750');
    const attachment = await masto.v2.media.create({
      file: photo.blob(),
      thumbnail: thumbnail.blob()
    });
    try {
      // post status
      const status = await masto.v1.statuses.create({
        status: caption,
        visibility: "public",
        mediaIds: [attachment.id],
      });
      // save posted photo to database
      await updatePhotosPosted(service, photosPosted, photoToBePosted);
    } catch (e) {
      functions.logger.log(`Error publishing photo on Mastodon.`, e);
    }
  } catch (e) {
    functions.logger.log(`Error uploading photo to Mastodon.`, e);
  }

I tried first w/o specifying an thumbnail. And then with an thumbnail not bigger than 750x750 px. Both end up in the same 500 (internal server error).

[individual8]

@neet Is that something than can be fixed?

[neet]

I didn't notice initially, but apparently, you seem to have forgotten await-ing the conversion from a File to a Blob. Try changing as the snippet below:

const attachment = await masto.v2.media.create({
-  file: photo.blob(),
-  thumbnail: thumbnail.blob()
+  file: await photo.blob(),
+  thumbnail: await thumbnail.blob()
});