I replaced a flushmont light fixure with a new dimmable LED Flushmount. I also replaced the old switch (see images below) with a dimmer switch. When I turn the LED on there is a flicker while it is turning on. After that initial dimmer it seems to work fine and the dimming feature works well.

Here's [a video of the light turning on](https://app.box.com/s/6ngj5ag03zx14sr436wc01y2zb9fk1x3).

The dimmer switch that I installed is a toggle dimmer ([this one](https://www.homedepot.com/p/Lutron-Toggler-C-L-Dimmer-Switch-for-Dimmable-LED-Halogen-and-Incandescent-Bulbs-Single-Pole-or-3-Way-White-TGCL-153PH-WH/202746671))
with 2 brass screws, one copper screw, and a ground wire. There was no ground on the old switch, so I connected one black wire to one brass screw, the other black wire to the other brass screw, and the blue wire to the copper screw. Since I am using this as a single pole switch, my understanding is that it shouldn't matter much.

My questions:
1) Is this simply due to having a single LED light on a dimmer?
2) Should I be concerned about my connections in the flushmount fixture or switch?
3) The old switch had the two black wires under one screw. Should I do the same on one brass screw in the new switch?

Thank you for any help!

[![enter image description here](https://i.stack.imgur.com/3pObC.jpg)](https://i.stack.imgur.com/3pObC.jpg)
[![enter image description here](https://i.stack.imgur.com/w9A5R.jpg)](https://i.stack.imgur.com/w9A5R.jpg)