Considerations about files and fileIds in Nextcloud to keep in mind
item here means files or folder

• items don't have a creator or modifier attribute, only owner
• items ownership is changed (but not the id) when a user receives a folder as a share and moves an item out of the share to an other location
• if a user is deleted all items that are owned by the user are deleted
• a received shared item can be renamed and that name will not be propagated to the owner or other share receivers
• a rename of an item in a received folder share will be propagated to the owner and other share receivers
• multiple names can be associated with the same fileId. e.g. :
  1. James has a folder called "Documents" with a file called "important.doc"
  2. James shares folder "Documents" with Peter
  3. James shares separately "Documents/important.doc" with Peter
  4. Peter will have receiver "important.doc" twice but both "location" of the file will have the same fileId
  5. when Peter takes the fileId and queries for its name OCP\Filles\Folder::getById() he will receive two objects and in case he renamed one of the representations of the file both of the objects will show different names

Julien approves all above statements.