A file's ID is its unique identifier. It is a read-only property.
It's good practice to save all of a file's properties in your code when you retrieve them.
A file's ID must be retrieved programmatically. It can't be retrieved through the editor or media manager. There are several functions that include fileId in their response:
There are several functions that accept a file ID, or an array of file IDs, as a parameter. The parameter is called fileId or fileIds.
In addition to the file ID, these parameters accept the file's Wix media URL. For example, wix:image://v1/0abec0_b291a9349a0b4da59067f76287e386fb~mv2.jpg/leon.jpg#originWidth=3024&originHeight=4032.
This is useful when using other Wix APIs, such as data, that return a media file's Wix media URL, not its ID. For example, if you are retrieving a CMS collection that contains an image field, the image files' IDs aren't returned but their Wix media URLs are returned.
A folder's ID is its unique identifier. It is a read-only property.
A folder's ID must be retrieved programmatically. It can't be retrieved through the editor or media manager. There are several functions that include folderId in their response:
A file's or folder's parent folder ID tells us in which folder it is located. Usually, a parent folder ID will be a string of random letters and number, for example '7984b3c5454e4371aqbd4f4eedde96bc'. However, there are 3 parent folders whose IDs look different (these are their IDs):
'media-root' - this folder contains all files and folders in the root level of the Site Files tab in the media manager.'visitor-uploads' - this folder contains all files and folders in the root level of the Visitor Uploads tab in the media manager.'trash-root' - this folder contains all files and folders in the root level of the Trash tab in the media manager.