The phrase "attaching proof" is correct and usable in written English.
You can use it when referring to the act of including evidence or documentation to support a claim or statement.
Example: "In my application, I am attaching proof of my previous employment to verify my work history."
Alternatives: "including evidence" or "providing documentation".
Please complete the reimbursement form and attach proof of payment.
just received a diplomatic correspondence by tweet from the US President," tweeted Gerard Brady, who attached proof of Trump's error.
The nonlinear dynamics of a microgyroscope consisting of a vibrating beam with attached proof mass and operating at high frequency is numerically investigated.
To obtain higher power output and conversion efficiency, especially to fit the vibration environment, attached proof mass on the end of cantilever energy harvesters is a useful way.
Responding to early indications that fraud involving the credit was widespread, the IRS is now requiring that taxpayers applying for the credit file their returns by paper, so that they can attach proof they have actually closed on a home.
Carefully quote the terms of your contract and attach documentary proof, if necessary, that clearly indicates how you upheld your duties or which circumstances beyond your control prevented you from timely handling them.
A novel laterally-driven inertial micro-switch with two L-shaped elastic cantilever beams as the movable electrode, which is attached to the proof mass, is proposed in this paper.
An optimal design of a piezoelectric coupled cantilever structure attached by a proof mass subjected to harmonic motions is developed to achieve efficient energy harvesting for applications in high-rise buildings.
Is there a burden of proof attached to paternalism?
Contrary to the streamlined federal requirements of the NVRA, Arizona required newly naturalized citizens (the majority of them in Arizona, Latino) to attach documentation of "proof of citizenship" to their registration forms, including in some counties copies of their naturalization papers.
