Attaching two separate email attachments into new email

Dear All,

Product I am using: iPhone 6

Question: I am having two emails with attachments, I want to get / download those attachments from those 2 emails and attach to a new email. Type of attachments are as below:

1st Mail attachment types: 1 zip file and 1 PDF file

2nd Mail attachment type: .7z file

I checked many options but couldn't figure out how to do that. Could any one please let me know how can we do that in iPhone 6. If out of the box that feature is not available then any app suggestions will also be helpful.

Thanks & Regards,

Vinay.