The file was made on a machine that knows you
Office documents record the account name of whoever created and last saved them, the company name from the software licence, and how long the file was open. Photographs record the device. A scan may record the scanner. None of this is visible when you read the document.
Copies are safer than originals
Do not forward the file you have. Retype the content into a new document made somewhere unconnected to you, or photograph a screen with a device that has location disabled. A clean copy of the content beats a cleaned copy of the original, because cleaning can only remove what a tool knows to look for.
The route matters as much as the file
Metadata is one channel among several. The account you send from, the network you send over, the time you send it and the pattern of who had access to the document are all part of the same picture. This page addresses the file. It cannot address the rest.
If the stakes are real, get proper advice
Established organisations publish detailed guidance for this situation, and secure submission systems exist that are designed for it. A free web page is a useful check, not a protection strategy.