I am having problems opening files on my ipad pro using the Excel program for ios. I can work on a file (located in Dropbox) several times and then for no reason that I can determine, I can no longer open the file.getting the message 'cannot open file, file corrupted'. 1tb ssd drive for mac. I can still open the file on any of my other computers, but the only way to get it to open again on the iPad is to do a 'save as' command and rename it on the computer. This is a huge issue as I have converted to traveling with my iPad pro instead of my laptop, so when on the road for business, I am stuck with files that cannot be opened. Does anybody have any knowledge of this problem that can shed some light on a fix? Otherwise the iPad Pro is going to become a home decoration and I'll go back to the laptop and an external wifi device.

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Oh I tried Microsoft. Their online support tried a couple of obvious things (delete and reinstall) that didn't work.

Then they referred me to their telephone support. Telephone support tried something more complicated (using MS OneDrive instead of Dropbox) that still didn't work.

Then they referred me to the same online support site I had started with. When I pointed out that I had already done that I was told there was nothing else they could do. Then they tried to sell me Office 365, explaining 'our free apps don't always work.' Microsoft support has always been aimed at people who simply don't know how to use their products. If you encounter an actual bug they will try to pass the buck, or up-sell you. I'm just trying to get their software to perform a basic function.

Thanks for the reply. I've done some more experimenting, and here's what I've found: If I create workbook on my Mac and save it in Dropbox or OneDrive, I can open and edit it in Excel for ios. However, if I open and edit an existing workbook on the Mac, and then save it, I cannot subsequently open it in Excel for ios (I get the 'file is corrupted' error message). I tried using Numbers instead of Excel, but Numbers for ios no longer integrates with Dropbox. (?!) My workbooks do contain simple formulas, but no macros or other unusual elements, and there are no language conflicts. I know this may not be an Apple problem, but any further advice is welcome. If I can't use my new iPad Pro for this basic function I might as well throw it in the trash.

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