When you receive a SharePoint invite, you will receive an email that looks like this (you may need to look in the junk folder):
Opening the link should take you to this page:
Fill in you email address and click next.
You may need to then verify your email address by providing an authentication code, depending on your accounts security.
After that, you will need to accept the permissions request.
This is an important step. If the permissions are not accepted then they will need to be manually sent out again by Tempus.
Upon accepting, you should then land into SharePoint and be able to upload and edit documents!
Troubleshooting for external users
I clicked the invite link, but it says I don't have permission to access!
The most common cause of this, is being logged into a different Microsoft account when accessing the shared files. When doing this Microsoft will check if your account has privileges, which it doesn't!
There are a few quick and easy fixes for this:
1. Sign out of all Microsoft accounts.
Access office.com, and select the profiles in the top right and sign out of them.
2. Copy the invite link in your email and past it into an incognito (Google Chrome) or private browsing (Microsoft Edge) session.
3. Clear your browser cache & cookies in Chrome or Edge