This Document gives instructions to avoid SAP GUI Security Pop Up when Download/Upload Attachments/Files from/to SAP.
Example Pop UP:
If you want to authorize to avoid this Pop Up, Please follow below steps.
On top of SAP screen, press customize local layout button
Then select Options
Below Pop Up appears
Select Security settings 
Status appears as Customized like below
Change status customized to disabled
Press Apply
Now Security Pop Up will be disappeared when you try to Upload or Download to SAP.
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