There is no current ‘easy’ connection from GF to ACF and the repeater field.
I’m guessing that you have selected a custom field such as ‘applicant_0_cover_leter’ for the custom field where the GF textarea to save to.
Instead of the ‘0’, you want this to be an incremental number, and this is where it gets tricky.
You will need to find a GF filter that allows you to hook in and modify the custom field name for the GF field to save to.
If you can do this, then you can find out how many rows already exist (or perhaps match the current user’s row) and find out the new row number to replace ‘0’.
I hope that helps.
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