Trouble attaching images to post

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I tried to attach images in one of my FS posts. Took a while to add all 16 images. Nothing was uploaded. I remember there used to have a “insert” button just as a member kindly pointed out. But after uploading images, all I see is 16 black squares, no previews and no “insert” button at all. I tried safari, Firefox, and duckduckgo. Nothing seems to work. I can’t even screenshot it to show you guys. Anyone had similar issues? Appreciate any pointers.
 
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I think I replicated it and solved it, can you do a shift refresh or clear cache and try again now

 
Posts
736
Likes
861
I think I replicated it and solved it, can you do a shift refresh or clear cache and try again now

Thank you!

I went back and looked at my old posts. All the attached images were in .HEIC. So I changed all my images to HEIC extension and it worked!