"File too big" error when emailing from Iphone 6S

"File too big" email error is occurring for users we have just switched over to new Iphones, from Droids.  when sending emails from their old Motorola Droids, they did not have this issue - so it's something with the new Iphones, it seems.  They are using Exchange email accounts from IPhone 6S phones.  any help is appreciated.
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Mohammad Ishtyaq KhatriConnect With a Mentor Commented:

This article from Microsoft might help you resolve the problem.
Damian_GardnerAuthor Commented:
Mohammad - thank you for your help.  So - you think that there might be something wrong with the Exchange settings, even though the previous Android phones did not get this limit message?
Justin EvansConnect With a Mentor Commented:
The Article from Mohammad is good,  the reason is the different way the old Motorola accessed Exchange,   probably through active sync which has settings for that.  Where as the IPhone probably uses Outlook on the Web For Exchange 2016.  There is differences between Exchange versions of what technologies enables the mobile phone to connect to Exchange.  

I hope this helps.  

Kind Regards

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Damian_GardnerAuthor Commented:
gotcha.  I made some changes and am having the users try again.  will report back soon.  thanks!
Jackie ManConnect With a Mentor Commented:
Try to install Outlook for iOS in your iPhone 6s.

Damian_GardnerAuthor Commented:
Increasing the email attachment size in the web.config file did the trick.  thanks for your help guys.
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