Our naming convention is often this for materials (from database):
1.2_MatDescription
1.3_MatDescription
4.5_MatDescription
22.1_MatDescription.
It is okay to replace the “.” by a “_”, because of limitations in naming in Unreal and other engines, but would be good if the initial number can be kept.
So renaming to
1_2_
1_3_
22_1_
Cheers
Robert