Mac freeze during file transfer + flashing light

You can never be too cautious regarding backup drives. So I went looking for more answers.

And yesterday, I found there’s a similar topic on this forum, but apparently, with a different outcome. The led blinking here is quite similar to the one shown in the video.

My drive seems fine, but you can only trust S.M.A.R.T to a certain extent. Same goes to Disk Utility and WD Drive Manager. They say drive is OK, in good health, and the LED keeps flashing fast on the bottom. Who do I trust, the software analysis or the LED?

How accurate is the gauge regarding failures? Should I post a video of my own?

Thanks once again for the support.