Why my Secure Folder doesn't work properly after update to Android Oreo?

[Android Central Question]

After update to Oreo, my Galaxy A5 2017's Secure Folder doesn't work properly, i have some issues about it :

1. I have set the security lock for my Secure Folder, but when i start to open the SF with a tap on the SF icon, the app directly open WITHOUT appearing lock screen as like before (when still using Nougat), it's so shame even the name is Secure Folder but everyone can access it because the 2nd lock screen doesn't appear.

2. Still about lock screen, even I've set the auto-lock with the option "lock automatically each time you leave app", but there's no work, Security Folder still can't lock itself, i change to other auto-lock options, still same, not working, my SF stil can access freely.

3. I tried to play some videos on the Secure Folder, but it can't play the video, the "Play" icon on the screen doesn't change to "Pause" icon even I touch it, it's so annoying can't play the video.

4. I want to backup the files before uninstall my SF, but every time I choose the "backup and restore" options, my SF will stopped working.

5. I can't even uninstall the Secure Folder, every time I choose uninstall option, my SF will stopped working too.

Anybody can help me about this (I hope the suggest without use Factory Reset)?
Thanks so much before

 

[Ex_F15_AIS]

Last night (8 june 2018) my AT&T Galaxy S7 had a large software update installed. Prior to this update, all of the apps in the Secure Folder (SF) were hidden behind the SF app - that is, you had to log into the app in order to see and access those hidden apps. Following the update, I tap on the SF app....no logon required and all of the apps hidden in SF are visible. I have tried changing to different options (pattern, PIN, bio), to no avail. I was going to uninstall and reinstall SF.....but it is no longer an option. Anyone out there with same issue that was corrected most recently?

Update: everytime Backup and Restore is run, SF immediately closes and wants to send feedback.