Updating status based on comment from community member. Will update again when we receive further giving info on the scenario.
If you open any Office document to view it from within Microsoft Teams just go to the File menu and hit Print. No need to download, screenshot or open in the rich client app.
An error occurred while saving the commentPrateek commented
Planner app works perfectly fine in standard channels of a Team. However, in any private channel (members are subset of Team), adding a new tab does not give option to add Planner app. There are many instances when a sub-team will be working on a special project and corresponding private channel will need its own planner.