App for sharing files on IPHONE?

As a business man I regulating send the same files to new clients which I have been sent via email from a different email address as a PDF.

Is there an APP I can save these files to, and any photos to which I can easily access to send to new clients instead of having to Forward the previous email which looks untidy and unprofessional even if I do delete the text.

I have an IPHONE 5.

DropBox, BOX, OneDrive, iCloud, Google Drive

You just airdrop it already to people around you.

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