Deal with Tor Browser not storing data in the application directory.
The sandbox container filesystem layout and permissions, and updater logic currently are dependent on the user profile being inside the application install directory, and the updater invocation fully updating the browser, including the addons/prefs/etc that are under the profile.default directory.
#20599 (moved) needs to be followed, and the sandbox creation code adjusted accordingly.
To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information