It's already enabled by default, but can be disabled within CB Gallery > Parameters > Photos > Validation or same path within the Gallery tab. Uploading in CB Activity takes its parameters from the profile gallery (so either globally or from the gallery tab). You will need to update to latest CB in addition to latest CB Gallery since it required improvements to our jQuery fileupload to support this for multi-upload usage.
Kyle (Krileon) Community Builder Team Member Before posting on forums:
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