I don’t have any idea why it didn’t work before or why it started now, but I’ll take it. I can airdrop comics from my computer to my iPad, putting them in the “files” folder. Then I can open Panels, find the comic in “files”, and import them.
Just noticed… When I airdrop a .pdf to my iPad, I am offered the choice to open it with Panels. Which works just fine. When I airdrop a .cbz file, my iPad does not offer Panels as an option to open the file. I need to save to Files and import from there. Not a huge deal. But since Panels is a comic book reader, I’d kind of expect my IPad to suggest Panels as the app to open and save .cbz.
Unfortunately, this is a never-ending bug and there no much we can do about it. This is not a bug in the app but a problem in iOS. File extension registration in iOS/Mac is fundamentally broken. Especially for file formats that are not standardized. PDFs usually work fine because it’s a standard format and there’s an “official” way to register an app to accept this format. But CBR/CBZ are not standardized and every comic app you install on your device is very likely to break the “Open with” feature to the others.