What's the difference between item attachments in the Product Hub and Product Development?

Product Hub supports item-level and item revision-level attachments. Product Development supports only item revision-level attachments.

Item revision attachments can only be edited through a change order in Product Development once the item is under change control. Item and item revision-level attachments can be edited in Product Hub through the item. Neither item-level nor item revision-level attachments can be edited in Product Hub through a commercial change order.

In Product Development, item revision attachments flow automatically to the next revision, unless deleted.

In Product Hub, item revision attachments don't flow to the next revision if the revisions are created outside the context of a commercial change order. If the revision is created in the context of a commercial change order, the revision attachments flows through from the previous revision automatically.

Item images are stored and shared as item-level attachments in both Product Development and Product Hub.