Maybe the downvotes are because you wrote your post in the opposite route. Of you read OP again, you will see that there is a whole post for that.

Thank you for your quality post anyway!

There should be an option in the setting to choose the max file size for which to generate the thumbnails.

Everyone piles on any comment which doesn’t align perfectly with the agreed perspective.

Sounds like every popular community on Lemmy. The only difference is the “agreed perspective”.