Ccenter module can not really file type(signature) checking, right now.

The check file signature that need to add code. And need determine form options semantics, also.

Will be following?
Attachment,file,accept_ext=jpg|gif|pdf,accept_type=image/jpeg|image/gif|application/pdf

This is not yet implement, just a plan.
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安冨　伸浩 (マイサイト管理人)