ChapterPagePhoto
A page photo addressed by its media row, never a newly uploaded storageId. A removed row drops the whole slot including its caption on save. Before the chapter-pages migration, legacy read responses retain storage-id photo references from the converter; these cannot be copied into a pages save until migration creates media rows. The same legacy exception applies to authorMediaId and ref mediaId.
Fields
- mediaIdstring · photo idrequired
A spot- or collection-owned media id of this guide. Upload chapter photos with
ownerTypecollection andownerIdcollectionId, then referencemediaId. Product and listing owners are refused. No copy is made when reusing a spot photo. - captionstringoptional
Gallery only: optional caption, at most 200 characters. Other page types drop it. Credit belongs to the media row, not this caption.