Minor suggestion for bank explanation doc improvement

On https://dev.freeagent.com/docs/bank_transaction_explanations, might be worth explicitly stating that it’s necessary to strip any base 64 preamble (eg data:image/png;base64,) for the data field for attachments:

  • data (binary data of the file being attached encoded as base64)

If you forget to do this and you get the error “attachment is not a supported format”. (Leaving this here for anyone else who has made that mistake :slight_smile: ).