75
Drag and Drop is an absolute mess
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I see this with flatpaks, the solution might be to grant permission to the app to the part of the filesystem your dragging from with flatseal/cmdline.
HOWEVER I do think the desktop is missing a pop-up which offers to do this for you when it happens. This is how android does it when an app needs access outside its own files, you just get a prompt to allow it.
This is the sandbox future - it's safer and you can trust that apps can't go snooping around your system but users shouldn't need to fiddle with perms all the time to get stuff done.
I think Apple has the best sandbox UX. By default sandboxed apps have access to zero of your files. It can't even see they exist. It's only granted access to any file/directory the user manually selects through a system UI - opening through file type associations, the open/save dialogs, or drag & drop. This means that access is given seamlessly, there aren't any prompts, and the user doesn't even realize there's a sandbox. If the program wants to manage a project, just have the user select the folder and all the sub-contents are also granted.