The ids of the entities that the file(s) are being linked to
To get the entity_id, open the entity (e.g. asset) in the SafetyCulture web app and copy the last part of the URL.
For example, in this link https://app.safetyculture.com/assets/765aa2e6-69cb-43b5-8ab4-48ab26e2a094,
the entity ID is 765aa2e6-69cb-43b5-8ab4-48ab26e2a094.