Hi Peter, according to this article on profile portfolios:
"Images can be in .jpg, .jpeg, .gif, or .png format. Attachments can be in .doc, .swf, or .pdf format. The maximum size is 5 mb."
I'm guessing it's the same thing for attachment in proposals. The 2 programs you mention are very specific to a Mac so most people won't be able to open them. Even for Mac users, you have to buy Pages if you didn't buy a Mac with El Capitan pre-installed.
I still have MS Office installed on my Mac, it saves me a lot of trouble with files from clients. Google Docs also works very well, it's free and it can convert to .doc or .pdf perfectly (from my experience). It can however be slow when working with documents of more than a few pages, especially on mobile, but that issue has been getting better in the last few months.
Unless you know for a fact the person you're sending it to has the program and a Mac, you shouldn't assume they can open a Pages file. Regardless, it's not an allowed format.
Save your Pages file as a PDF, which you'll have no trouble attaching.
If this is a file you're handing off to a client, you'll need to use Dropbox or a similar site - there are several out there.
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