I often use the "typewriter" tool in Acrobat Pro to make changes to the pdf files, and they work just fine on my computer. However, when I send these forms to other people who uses the Adobe Fill & Sign app on iPad, the changes I made never show up.
What's can I do to prevent this from happening again?
What changes were made in the form?
Also tell the OS on their IPads.
I hope whether they are compatible with higher version of Reader/Acrobat .
Please check the document properties at your end one.
We released an update to the iOS Fill & Sign app at the end of May '16 that, if you sign into the app with an AdobeID and move the form online (long press on the form thumbnail and choose to move online) then the content should be shown.