Here are the steps to move a file from OneDrive to Microsoft Teams:

Step 1:

Sign in Microsoft Teams with your Office 365 account,


Step 2:

navigate to Files > Cloud Storage > OneDrive

Select a file.  example: Book5.xls

Step 3:

Select Move > Browse Teams and Channels > choose the location and click Move.

Step 4:

Then you can check the file in Teams > Files.