Given that Every Door does not upload changes automatically, they can lay in its database for weeks. But don't worry of conflicts: just before uploading, it downloads fresh versions of all modified objects, and does a three-way merge for those that have changed. So no tag changes will be lost, and no special panels for conflict resolution needed.
If some changes do fail to upload and get stuck, delete them from the settings → pending uploads panel.
@everydoor Yesterday I was pleasantly surprised to discover that ED has very robust networking code! While connected to the public Wifi of a mall, I started uploading changes, but the wifi dropped off in the middle of the upload. It kept spinning. As soon as I restored the connection, it performed a clean rollback and I could try again. No mess, no duplicates, no work lost! 👌