Some users have reported never getting the “Copy Share URL” option when tapping on the 3 dots. Instead, they get a “Share” option as shown bellow.
Update to the latest Regrann release 2.62 for Share support. To use, tap on the 3 dots, then on Share. Scroll down to find the Regrann icon and tap on it.
Please let us know if this new release does not solve the issue for you.