I think it’s a regression in v18 rather than an account or download size setting, especially as the same configuration worked before the update. first check whether the issue happens with both “From anyone” and “From contacts”, and whether it affects all senders or only certain messages. Also try clearing K-9 Mail’s cache and restarting the app.
I still cant see images and im in version 22
I tried both ways…no images either way…im on version 22
But if i select forward or reply the images will show on cell phone until I rotate phone…they disappear again…im close to just going to gmail…ive used K9 for ad long as I can remember