Some of the files attached in this way already have a text layer hidden under the image of the document, e.g. invoices generated to PDF directly by the invoicing program. By selecting a text fragment with the cursor, you can copy it, as it is done e.g. in the content of e-mails or MS Word files. Some, however, will be only images. In such a case (and only if you need it) press the icon: 
Then wait for the content to be read. After a while, you will be able to copy text fragments directly from the document 
and paste it into the form fields. In the above example, copying the tax identification number and pasting it into the CSO plug-in field will allow you to download the invoice issuer’s data and automatically fill in the form fields such as name, address, zip code and city. Of course, you can copy a lot more, even the content of the attached contract. Note: Image files subjected to the OCR process will be converted to PDF format.
