Finally Forklift 4 beta is available. Devs are looking for testers. Looks pretty well so far.
blog.binarynights.com
You can get it here:
Download ForkLift 4 beta 1
ForkLift Blog
ForkLift 4.3.5 brings a new macOS Tahoe-inspired design and improved cloud file handling for iCloud, Dropbox, Google Drive, and other File Provider services.

You can get it here:
Download ForkLift 4 beta 1