Task: I want to save my phone storage for a YMCA volunteer event, but the data is important. Upload all the study PDF files to the Dropbox app.
Steps:
Open the Dropbox app
Click on the Upload button 
Click on the Create or upload file option
Select the Upload files option
Click on the three dots more button at the top right corner of the screen
Click on the Select all option
Click on the SELECT button at the top of the screen
Click on the SELECT button at the top of the screen