Hello,
I've created Power Apps form which allows customer to submit a bug or a suggestion to improve certain product. I've inserted the form below so you can get an idea and follow the logic.
Via SharePoint connector my Combo boxes filter unique values of a list (Microsoft Lists) which contains all possible combinations of a product (3 currently) and a subject (Bug or Suggestion) => hence 6 combinations. For each of these combinations, there's a column containing unique email address to which the customer later sends the email via Submit button. User also fills out version of the product, chooses level of importance, describes the problem in 2 text labels below and preferably attaches some files. The text input in the bottom left corner is not important.

After that he can submit the form. In the button I use Set() to set the email recipient (I use LookUp function to figure out the right address), Office365Outlook.SendEmailV2() to send all the important information and Reset() to reset all the values. See below:

I then wanted to upload the attached files to OneDrive (for business) and add a link to those files to the body of the email, but I haven't found any documentation, video or sample showing this. I would be glad for any advice on how and if this can be done.