Add .dropboxignore directory to exclude folders without using selective sync

A basic gap with the Ignored files feature is that a .dropboxignore file would be synced across device. So it'd automatically preserve the configuration across multiple Dropbox instances (or migrations). It'd also make it possible to apply broadly on all files matching a pattern (e.g. excluding *.tmp), and be much more practical to manage than having to run a Powershell script.

A partial workaround in the meantime could be to use ChatGPT to generate a Powershell script that takes a .dropboxignore file as input and produces equivalent commands, but it wouldn't help if the goal is to exclude files or folders based on a wildcard pattern (meaning more files could be created that'd match the pattern but would not be ignored unless the script is re-run).