Followed same sandboxed is false,
tried by setting xattr also
May 12 20:18:58 swi-mdm9x28-wp user.info Legato: INFO | supervisor[876]/supervisor T=main | app.c CreateFileLink() 2183 | Skipping file link ‘/home/root/lib_custom/libcustom_Arm.so’ to ‘/legato/systems/current/appsWriteable/myfirstapp/lib/ libcustom_Arm.so’: Already exists