I'm copying a 5GB file from a fast SSD to a slow USB drive with writing speed ~25MB\s (around 20x slower than SSD reading speed ) with Dolphin 20.12.2.

The 'Copy' notification pops up in the bottom right corner saying around 25s remaining and after that time it changes to 'Copy completed'. However, USB drive LED would blink about 4min more after that displaying that data transfer is still in progress. So, I am unable to know when the copy operation actually completed.

I guess the issue is that Dolphin tracks the copying progress by reading a file and not by actually writing it onto a target device. Could that be the case? Is there a config option to fix it?