iPad mini
I cannot get my iPad to connect to server
iPad mini 3, iOS 12
An over 7-year old, 2013 iPad Mini 3 cannot upgrade beyond the current iOS 12.5.
It cannot upgrade to iPadOS 14, at all.
It's internal hardware is too old, too underpowered to run/handle all of the new, advanced and internal hardware resource intensive features of the newer iPadOS.
Sorry.
If you need/want an iPad with an up to date iPadOS with access to current, updated apps, then you really need to seriously consider a new iPad model OR a much “newer” , used iPad model capable of running the latest iPadOS versions.
There are plenty of newer, older iPad models that can run the latest, current versions of iPadOS.
Sorry & Best of Luck to You!