I have a list that has a lookup field on a documents library. I can get and expand fields no problem only if they are single line of text fields (FieldTypeKind = 2). But when I have a multiple lines of text field (FieldTypeKind = 3), then it doesn't work.
For example, I have the field with name: props. The following works if it is single line of text:
But I need props to be a multiple lines of text (more than 255 chars), when I set it to that then I get the following error
The query to field 'files/props' is not valid.
The internal name is correct (props). If I change the field props back to single line of text field there is no error.
How can I expand a multiple lines of text field with the REST API?