75
Drag and Drop is an absolute mess
(feddit.org)
From Wikipedia, the free encyclopedia
Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
Community icon by Alpár-Etele Méder, licensed under CC BY 3.0
Based on not knowing what your system looks like (OS, DE, how you're moving files, where you're moving them, etc), the first place I'd try is getting Flat Seal from the flatpak app store. It's a permissions manager for flatpaks that might help you out. If you're trying to move files into a folder that has escalated permissions, it may give you some problems. Try fiddling with the settings in Flat Seal.
I don't really use flatpaks, so I couldn't tell you exactly the setting to look at, sorry. Never had an issue with drag/drop myself.