I have one list which stores tasks and one library which stores forms that created those tasks on the same site.
I have a workflow on the list which runs when the status field on a task is updated, I then want it to update a field in the library. The forms have matching titles to the tasks on this list.
If i use the Update Item action and select the library, the only fields that display are Title, Content and Name, none of the other custom fields I have added show.
Are there any other actions which would allow me to do this?
Agreed, you have to connect those form field to a Sharepoint Field to get it in your update item actions.
If you can't directly connect a form field to a Sharepoint field (if you have to perform more actions on this form field before it to be sent to the SP Field), do it in the Worfklow that runs after the submit of your item (the one that is triggered when create or Update)