Are there limitations on images attached in templates?

I tried adding a template with 2 screenshots (macos version), from the template settings it just resets and drops the entire template. I “forced saved it” through a draft.

The template created when loaded does not show any images, furthermore if i try to select it through the template settings it just won’t open at all. I can’t even select it for deletion.

Has anybody else experience this? Could be because my screenshots are too big? Is there a fix?

Edit: Apparently copy pasting the draft to new draft it also does not work with the images failing.