Micro SD card which was always inside connected. Does it matter? When I realized its corrupted I made a copy to internal drive and google drive (link above). Thank you!
Not a good idea. Those cards are usually formatted in Fat32 or ExFat which Logic does NOT like and leads to project corruption as you have experienced now.
Get yourself a dedicated external HD, either USB 3 or Thunderbolt, and:
If it's spinning, make sure it's 7200 rpm high performance and format to MacOSX Extended, or
If it's an SSD, format to APFS.
You can do that with Disk Utility on your Mac.