My custom gpt took HEIC images no problem - now it doesn't. What happened? How to fix?

For months I’ve easily uploaded images right from my iphone to this custom gpt. I went in tonight to make some minor updates, and now HEIC images are not working. This is 100% of my use case… no one is going to take the time to convert formats (why should they?) so it’s pretty much hosed the whole thing. What am I missing?

Related/unrelated… is there a way to revert custom gpts (like, back to the last version that worked) or compare/contrast versions? I know it’s not code, but still…

Version history is not something that is available for GPTs. It would be a useful feature to have.

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