Ipad storage

No, you can't. All iOS device (iPhone/iPad/iPod Touch) use SSD storage which is fixed at the time of purchase and there is NO way to increase the physical storage at all. If you are running out of space on your iPad, you need to delete things you don't need or use, such as Apps, Photos, Videos, Texts, Email, Files, Music, etc. Or if you need a device with more memory, maybe it's time to consider buying a newer device with more memory.

No.

There is no means to upgrade the internal storage.

Your options are a more capacious iPad replacement, or offloading some of the content to other external storage and/or to iCloud.

What iPad kind/model do you have/own?

What iOS/iPadOS version is it currently running?

What is the total rated internal storage capacity of this iPad and how much of that storage capacity is left?