[Bug]: Question mark comes instead of asset thumbnail in Asset's left grid

[rajeshkumarhm]

Pimcore version

11

Steps to reproduce

Go to the Assets section -> Upload an image with capital letter extension name, for ex: "rabbit.PNG" -> Question mark icon will be appeared in left tree instead of thumbnail

Actual Behavior

Go to the Assets section -> Upload an image with capital letter extension name, for ex: "rabbit.PNG" -> Question mark icon will be appeared in left tree instead of thumbnail

Expected Behavior

Go to the Assets section -> Upload an image with capital letter extension name, for ex: "rabbit.PNG" -> Thumbnail should be displayed instead of question mark icon.

[rajeshkumarhm]

[kingjia90]

Thank you for reporting!

It's clearly because the file format is uppercase as JPG, which might not be best practice.
If renamed to .jpg it should work fine

[kingjia90]

I've created a PR #16886 that should help and fix it, but in general (by looking at all overall usages) it seems that it would be not recommended to use it as upper cased