With release 1.2.0 this is not possible anymore. Both importers fail when choosing the attachment option. I do immediatly get a 500 server error, no attachments are imported. For these tests I always use blank installations of xf1.2.0 with clean and healthy file system and fresh database. Trying to use the core importer is 100% without any add-on installed or any other setting/modification. For the add-on importer this is the only add-on installed, overwriting the vbulletin.php in importer library.
I can reproduce that importing attachments still works in beta3 (add-on) and it does not work in release 1.2.0 (core or add-on) anymore. I deleted my zip of 1.2rc2 too early, so I cannot try that again, but I am pretty sure it worked, both ways.
Its happening on a local test system, cannot try on Linux server at the moment:
Win 64Bit Home Premium
1.1 GB attachments in file system in vB4 folder
What am I doing wrong, please?
There is no entry in the server log of xf...