Apple ProRes 4444 mov won't import to Premiere - File contains more than one image descriptor

[Merry_Mirage5DE5]

PowerPoint v16.98

Premiere Pro v25.3

MacBook Pro M1 Max chip

Mac Sequoia 15.7.1

I'm using PowerPoint to export slides as a MOV using Apple ProRes 4444 and I have checked the 'Make background transparent' box so that I can have 'floating' animations (made in PPT) next to a webinar speaker.

When I go to import that mov into Premiere (either by dragging, File -> Import, or using the Media Browser) it doesn't let me import at all. I get a File Import Failure popup with the error message 'We were unable to open the file on disk'. The Event details tell me 'File contains more than one image descriptor'.

There aren't any further settings (as far as I know) that I can change when exporting from PowerPoint - literally choose the file type, codec, and switch on transparency. I can't import the mov into After Effects or Media Encoder, but I can open the mov fine in Quicktime and see the alpha transparency. The problem is - I used this exact workflow in June this year, and I didn't have an issue at all. I've just reverted Premiere back to version 24.6.8 to check if I could do it, and I get the same error.

Any ideas?

[Ann Bens]

If it worked in the past, try exporting again from PP.