Box drains my iphone 7 battery, even though it shouldn't be open or running in the background
Each morning I use a "Numbers" app file which is saved to Box on my iphone so that I can use it on my MacBook pro. The problem is whilst I haven't directly opened the Box app to do this save, it opens and continues to run in the background and drain the battery (60% in an hour is typical). Eventhough in the app settings "Background app refresh" is off as is "Notifications", I can only stop this drain if I turn the phone off and back on again. I am running ios 14.2 and I keep all apps up-to-date. Any thoughts or solutions would be most welcome.