SharePoint Online vs. Microsoft Teams for Project Management and Cross-Site Document Searchability

Hey Deleted, are you saying that when you use the search  box at the top-left of the "SharePoint" home page you cannot find the file you stuck in the Teams app? I've taken a look under the hood at the SharePoint sites provisioned with groups I created in Microsoft Teams, and they look like full-on, modern SharePoint Team Sites.

I did a quick test and tried the following-- are you not seeing similar in your tenant?

1- Add a file to a channel in Microsoft Teams (or even better, do this test using a file that is already uploaded to Teams so you don't have to wait for SharePoint to index the file):

Add a file to TeamsAccess SharePoint Search from the SharePoint landing pageSearch for and find your MS Teams file