For some reason when sync small files like pdf. It takes 20 mins for it to show up on my iPad Air. However , across my other devices (more modern like iPhone XS and iPad Pro) it shows instantly.
iPad Air Wi-Fi
If your WiFi is good and nothing has changed with your router/modem settings or ISP, then try restarting the iPad -- Restart your iPhone, iPad, or iPod touch - Apple Support.
Does the iPad Air have the latest iOS?
Well, I am as flummoxed as you are but if you're willing you can try reaching out to Apple Support to see what their take is on this issue -- Contact - Official Apple Support.
If they do resolve it, be sure to return here to post the results/solution so that we can learn from this.
I’ve done that.
Yes it is.
iCloud Drive sync super slow on iPad Air
