Re: feature_galleries & bulk import
Ignore the error and carefully trace your permissions. Start with object permissions on the gallery, then look for category permissions, if you're not using either of those and thus global only, then check the appropriate user group permissions.
Does that user group have these permissions:
tiki_p_batch_upload_file_dir
tiki_p_batch_upload_files
Also make sure that the specific user group can actually see the gallery, having the batch permission will do them no good if that user group doesn't have:
tiki_p_view_file_gallery and possibly
tiki_p_list_file_galleries
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