TLDR: "The uploaded image is too big" error message on TMC might refer to a limit on the physical (pixel) dimensions of an image, not the number of bytes in the file.
Got a brand new iPhone 15 Pro to replace my old iPhone 11. I started getting a bunch of new problems uploading files into posts...no matter what I tried I was getting "The uploaded image is too big" errors from TMC. I did everything I could think of to reduce the file size (i.e. reducing JPEG quality) but nothing seemed to work, even when I wound up with something smaller than files that had uploaded successfully in the past. On a whim I decided to try resizing the dimensions of the photo (I used Preview on macOS) and this allowed me to upload the photo.
Bruce.
Got a brand new iPhone 15 Pro to replace my old iPhone 11. I started getting a bunch of new problems uploading files into posts...no matter what I tried I was getting "The uploaded image is too big" errors from TMC. I did everything I could think of to reduce the file size (i.e. reducing JPEG quality) but nothing seemed to work, even when I wound up with something smaller than files that had uploaded successfully in the past. On a whim I decided to try resizing the dimensions of the photo (I used Preview on macOS) and this allowed me to upload the photo.
Crop, resize, or rotate an image in Preview on Mac
In Preview on your Mac, adjust an image’s size by percentage, scale it proportionally, fit it to specific dimensions, or reduce its file size.
support.apple.com
Bruce.