CyanogenMod and F-Droid Store: Open Source App to hide NSFW Pics/Videos?

[Quotenfrau]

I installed on my Nexus CyanogenMod and use only applications from F-Droid Store (Open Source).

I love it to use Android without being under Google surveillance and tons of ads.

The only thing I miss is something like a safe to hide my NSFW collection. Any idea? I have no PlayStore and Google Account.

 

[ucfgrad93]

Dropbox?

 

[blackhand1001]

What app did you use to do that when you used the play store. It may be available outside the play store as well.