Where can I get really clear instructions on transferring a download (PDF/MOBI) from phone to app and from computer to app

Where would I get (or does anyone have instructions they would be willing to share) really clear instructions to do the following..
1. Transfer a PDF document from your phone downloads into your Kindle app
2. Transfer a MOBI document from your computer downloads into your Kindle
3. Transfer a PDF document from your downloads onto your kindle?

Thanks :-)
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Uttam KumarConnect With a Mentor Tech Support ExpertCommented:
You can go thru these links and see if it helps you https://pdfblog.com/2012/03/12/email-pdf-kindle/ & https://www.amazon.com/gp/sendtokindle
agwalshAuthor Commented:
Exactly what I was looking for!
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