What is the problem with establishing a Wi-Fi connection with a computer through 2 routers?

Question

Computer networks

The situation is this: the Internet enters the apartment via GPON to the Huawei terminal (HG8245T), which distributes Wi-Fi and is connected by wire to a TP-Link router (TL-WR741N), which in turn is connected by wire to two computers.
There are a number of applications on the tablet that can manipulate the computer via local Wi-Fi, including climbing the ftp server on the computer, or vice versa, allowing the computer to access the ftp server on the tablet. When connecting the HG8245T directly to the computer with a wire, all these manipulations and connections work properly, but in this scheme, 2 computers remain out of business.
When TL-WR741N is connected between the computer and the HG8245T terminal, contact with the computer via Wi-Fi becomes impossible.
Obviously, the TL-WR741N becomes the culprit of the problems, but what search query to give and how to fix this situation - I have no ideas.
I ask for advice on what settings to twist so that you can connect to the computer using the second scheme.

Answer 1

Put TL-WR741N into AP mode, everything will work.