I use this “own cloud” service to offload old files from OneDrive & Dropbox.
A problem that crops up from time to time is the loss of macOS Finder integration, so the sync overlays fail to appear. To fix this problem, follow these steps:
Context menus show up in file browsers on Mac and Windows for the sync shares that have Selective Sync option ON. So in first place please check that this option is indeed enabled. If it is, but context menu items still don't show up, follow the steps below.
MAC OS X (10.10 and newer):
If Finder does not show Sync icons for synced folders and/or the context menu lacks Sync option (“Sync to this device”, “Remove from this device”, etc), or the “Share folder with Resilio Sync…” option, try resetting Mac browser extension:
1. System Preferences > Extensions > Clear and then reselect the checkbox for Sync:
2.Relaunch Finder: press Alt + right click on Finder in Dock → Relaunch or click on Apple → Force Quit → Finder:
3.Restart Sync. Note that other applications (e.g., Dropbox, Google Drive, etc) use the same extensions, so if such apps work with the synced folders, there might be a conflict which may result in the absence of Sync icons as well as sync-related items in the contextual menu. If you try the above steps but menus/icons keep disappearing, please contact Support.