Downloading Large PPT file from Email - not working

12Mb is probably too big for the email app - 10Mb is the normal limit.

Sync in through iTunes ?

Have you tried loading the file on the ipad with Air Share and then opening it?

how else would I use this file in Keynote on the iPad?

http://support.apple.com/kb/HT4088

If you're trying to import that file into Keynote on your iPad, you won't get it there by emailing it to yourself, regardless of size. You have to do the following.

1) Connect your iPad to your laptop.
2) Once iTunes is open, click on your iPad under Device in the left column.
3) Click on the Apps tab on top.
4) Scroll down to the File Sharing section.
5) Click on Keynote.
6) Click on the Add button.
7) Browse to the location of the PPT file on your laptop, select it.
8) Now you have your file ready to import in iTunes.
9) Click on the Info tab on top.
10) Click on Sync below. Once it finishes, you'll have your PPT file in Keynote on your laptop.
11) On your iPad, click on Keynote.
12) Click on the little folder icon at top right corner.
13) Click on the PPT file in the list that opens. There you go.

Another favorite option is File Apartment (http://www.fileapartment.com). Easy to use, no software to download or registration, up to 1 GB, free option, safe, and secure.

As a file system for the iPad I am liking good reader. It allows you multiple ways to get files onto your iPad and then you can send files to iwork to edit.

The iTunes suggestion above is right on.

If that doesn't work, I would recommend opening the document in Keynote on your Mac, converting it and saving it, then syncing the Keynote presentation over to the iPad. Its possible the iPad version of Keynote just doesn't have the horsepower to convert such a large file.

HTH.

Another favorite option is File Apartment (http://www.fileapartment.com). Easy to use, no software to download or registration, up to 1 GB, free option, safe, and secure.