I'm having many similar issues with the app. I was using SyncTrayzor for a while but I liked the idea of selective sync and went ahead and paid for the license for Resilio Sync.
I even tried using the in app Support link to send feedback. It offered to send my device logs as well and it got stuck on 0% trying to upload the logs. 😂🙄
Has anyone gotten a refund since "Link all your devices" is part of the advertised package for buying a license?