Sending emails

Is there a way to attach a document and send it via an email in Wix? I see “email campaigns” app, I see a way to send an email but I do not see a way to send a single email with an attached doc. This is a basic function so I must be missing something. For example, a customer is asking me to send him a copy of the manual. The manual is one of the available docs. How do I do that? Thanks

https://www.wix.com/corvid/forum/community-discussion/include-images-documents-in-form-submission-email
https://support.wix.com/en/article/adding-a-document-to-your-email-campaign

Hi,
thank you for your reply but neither links are helpful. The first one refers to code that it turns out have bugs and I must admit, I have difficulty following.
The second link refers to email campaigns, which is what I expressly said in my question, is not what I am after.
I am after simply a way for a user who after logging on my Wix site, wants to have a manual emailed to him/her. A basic business function that it appears Wix does not provide. This is mind boggling. I think that I made a mistake in selecting Wix.

Could a workaround to this be to send a link to instead download the document?

Not really, that would be a multi step process, but thank you for replying
If a customer wants a manual, instructions, a brochure it would be unprofessional to send a link considering that many people are not computer savvy