Synchronization of LM 3 Classic and LM 4 libraries

Hello,

I have been using both LM 3 Classic and LM 4 gold versions on the same phone (Android) for several years. When creating routes and adding points regardless of which version they were visible in libraries of both versions . Probably both versions of Locus used the same destination folder and rather it was a system setting - I never set or changed it. Unfortunately, after the last LM4 update, the entire library with routes and points in LM 3 Classic is empty. After creating a new route in LM 3 Classic and saving it to the library, it also appears in the LM 4 library. Unfortunately, after restarting LM 3 Classic, the route library is empty again. Is it possible to set it up in such a way that the library is shared by both versions (As it was before the LM4 library update). I would also add that in LM4 after the update are all the routes from before the update.
Yours sincerely