I'd be more than happy to assist you. When you say your apps are on your SD card, I don't follow you. Typically you go to the Google Play store and download and install your apps. Then you go to your app drawer and run them.
So are you saying you backed up the apps from another phone and placed them on your SD card? I'm not sure I follow you just yet.
Good morning, sorry for the delay. First off, thank you for your service and I'm sorry to hear about your disability. All the more reason we have to get these slots working again for you! The good news is I follow you. To free up internal storage you moved apps to your SD card.
When you move your apps to the SD card there's on caveat, not all apps will work from the SD card. I'm sorry for all the questions but it will help me provide you an accurate solution.
To answer your other question, you can't "move the apps to the cloud" to run them. That's not a feature available on the iPad or Galaxy. The good thing about the Galaxy (more reason to love Android) is you can expand your memory with an SD card. Which it sounds like you did. Now we need to figure out what the app aren't working.
When you say old applications for your iPad, unlike Android an iPad that's not jailbroken only has one method of obtaining apps and that's from the Apple App Store. Meaning whatever version of the app is available there is your only option.