I use my wife's BlackBerry telephone to take photographs as the camera on my Microsoft Lumia 950 XL is broken, when I use the Wikimedia Commons app on her device I can freely sign in and out to upload but as the mobile app is extremely user unfriendly and I cannot upload more than one image at a time so I prefer to use Google Chrome to upload more images at a time. But as I exclusively use it to upload images I took I sign out after using it but then I also automatically get signed out on Microsoft Edge on my Microsoft Lumia 950 XL phablet as well. There should be an option where you can stay signed in on one device even if you sign out on others.