Get a list of collections using:
https://api.zotero.org/users/[USER ID]/collections?key=[API KEY]
Where:
[USER ID]: Listed here: https://www.zotero.org/settings/keys[API KEY]: Create one here: https://www.zotero.org/settings/keys
Find the "key" attribute corresponding to the collection you want to use. This is your [COLLECTION ID].
Then, in Overleaf, create a new file. Select "From External URL", then insert the following URL: