On Android:
Open the Files or My Files app ,Tap on Downloads folder. You’ll find all your downloaded files there.
If you downloaded it using a browser like Chrome, open Chrome , Tap the three dots (top right) , Select Downloads to view your list.

On iPhone:
Open the Files app, Go to Browse,  Tap on Downloads under "On My iPhone" or "iCloud Drive."

On Windows Laptop/PC:
Open File Explorer, Click on the Downloads folder on the left panel.

On Mac:
Click the Finder icon, Select Downloads from the left sidebar.

If you used a specific app to download, open that app and check its “Downloads” or “Library” section