Cloning/importing images should assign original alt tag, title, description, and caption to attachment metadata

[greatislander]

Prerequisites

• Can you reproduce the behavior you wish to address with all other plugins deactivated?
• Are you running the latest version of Pressbooks and the latest version of WordPress?
• Are you experiencing this issue with one of our built-in root or book themes?
• Did you perform a cursory search to see if your bug or enhancement is already listed?

Description

While cloning or importing, an image with alternative text, title and caption retains this data in the image markup but the metadata is stripped from the media attachment in the library. The description field of the attachment metadata is not reflected in markup, and is lost altogether. This data is exposed in the API, so we can add it to the cloning and import routines.

See: https://guide.pressbooks.com/wp-json/wp/v2/media/2022
(Used in: https://guide.pressbooks.com/wp-json/pressbooks/v2/chapters/1356 )

"title": {
  "rendered": "languageuserprofile"
},
  "author": 84697,
  "comment_status": "closed",
  "ping_status": "closed",
  "template": "",
  "meta": {
  "pb_show_title": "",
  "pb_ebook_start": "",
  "pb_short_title": "",
  "pb_subtitle": "",
  "pb_authors": [],
  "pb_section_license": ""
},
"description": {
  "rendered": "<p class=\"attachment\"><a href='https://pressbooks.com/app/uploads/sites/10270/2016/08/languageuserprofile.png'><img width=\"300\" height=\"159\" src=\"https://pressbooks.com/app/uploads/sites/10270/2016/08/languageuserprofile-300x159.png\" class=\"attachment-medium size-medium\" alt=\"Language setting on the User Profile page\" srcset=\"https://pressbooks.com/app/uploads/sites/10270/2016/08/languageuserprofile-300x159.png 300w, https://pressbooks.com/app/uploads/sites/10270/2016/08/languageuserprofile-768x408.png 768w, https://pressbooks.com/app/uploads/sites/10270/2016/08/languageuserprofile-1024x544.png 1024w, https://pressbooks.com/app/uploads/sites/10270/2016/08/languageuserprofile-65x35.png 65w, https://pressbooks.com/app/uploads/sites/10270/2016/08/languageuserprofile-225x120.png 225w, https://pressbooks.com/app/uploads/sites/10270/2016/08/languageuserprofile-350x186.png 350w, https://pressbooks.com/app/uploads/sites/10270/2016/08/languageuserprofile.png 1069w\" sizes=\"(max-width: 300px) 100vw, 300px\" /></a></p>\n"
},
"caption": {
  "rendered": ""
},
"alt_text": "Language setting on the User Profile page",

Steps to Reproduce

1. Clone an image with any of title, description, alt text, caption.
2. View the image in the clone's media library.

Expected behavior: All four metadata are preserved during cloning.

Actual behavior: They are missing except in markup within the post content. Description disappears altogether.

System Information

Pressbooks: 5.5.0-dev