Process HEIC files on upload

I've encountered this limitation too.  Some JPGs would be reported as "not valid" or the operation would consume too much memory and/or take a considerable amount of time to perform.

We use GraphicsMagick internally (faster, supports more formats), but it doesn't support HEIC/HEIF.  I read that ImageMagick supported HEIC, so downloaded the portable version and performed a simple HEIC-to-JPG conversion using a popular Nokia HEIC file and it successfully (and quickly) converted to JPG.

    c:\ImageMagick\Magick.exe "c:\images\In.HEIC" "c:\images\out.jpg"

After converting to to JPG (or PNG since it's lossless), you can then resize, etc.  You can also perform those transformations (and more) using ImageMagick too (recommended).