Uploading a file to Files and links (attashments)

Hello, colleagues. After generating a report, it is necessary to attach it as a file to the record, in the Files and links detail. The application from "customerfx" is not suitable. Here, it is necessary to automatically select the report form by pressing one button, etc. 

I ask for your help. Perhaps there is somewhere to look at the code. Or you can point to an article in the Academy, or something else.
As a last resort, I will analyze the principle of operation of the application from Ryan (customerfx").
Thank you all.