You can upload files to your OneDrive through Teams. Then you can share that link with anyone. You can do this from a computer or any device via the Teams app or Teams on the web. 

1) Open Microsoft Teams and select the Files tab on the left. Then select OneDrive. 

2)Upload a file via the option at the top of that page. Navigate and select the file from your device storage. 

3) Once uploaded, find the file in the list and select the three little dots next to the file. Select the Copy link option. 

4) From the menu that opens, select the Sharing option People with existing access can use the link to change sharing permissions

5) For Trine users, select People in your organization. That will allow Trine users that receive the link to access the file. For external users, select People you choose. You will need to manually add email addresses to allow them access to the file. 

6) Under More settings, elect what type of access/permission they can have - edit or view only. Select Apply at the bottom when finished.