You can use Custom Action in Adalo to update in AirTable field with multiple relations ( for example guests and tags, many to many relation )
When you try to send Update Tag from Adalo to AirTable your JSON look like this:
0: "[recpGIq2zW32QfeLt, recc9ADs3UBnh1Zeo]"
and you have a error:
"message": "Value is not an array of record IDs."
because Airtable waiting this:
and one more: in AirTable API Doc:
To link to new records in tags_uuid, add new linked record IDs to the existing array. Be sure to include all existing linked record IDs that you wish to retain. To unlink records, include the existing array of record IDs, excluding any that you wish to unlink.
the case is to send to AirTable valid JSON