Hi
I have an Elegoo Uno R3. When I chose "Arduino Uno" from the boards list in the PC version of Arduino, it never uploaded the program. The online version of Arduino didn't recognize the board either. I looked up drivers and tried installing CH 341 but it said it was pre-installed.
Hi @DragonTheta. Let's start with troubleshooting the problem with the PC version of the Arduino IDE. That is usually a little bit easier to do than troubleshooting Arduino Web Editor, both because it removes the "Arduino Create Agent" from the equation and also because the helpers here on the forum tend to be more familiar with the Arduino IDE than Arduino Web Editor.
Please do this:
</> icon on the post composer toolbar.```) to your reply to make sure the error messages are correctly formatted.No point fiddling about with CH320/ CH341 drivers.
The Elegoo UNO R3 actually is an Arduino UNO, not a fake using a CH340. 
You need to have the UNO/ Mega driver which is I believe, part of the IDE download.
You are presumably using Windoze, does the board show up in the Device Manger?
Thank you
Arduino: 1.8.19 (Windows 10), Board: "Arduino Uno"
Sketch uses 1938 bytes (6%) of program storage space. Maximum is 32256 bytes.
Global variables use 50 bytes (2%) of dynamic memory, leaving 1998 bytes for local variables. Maximum is 2048 bytes.
C:\Program Files (x86)\Arduino\hardware\tools\avr/bin/avrdude -CC:\Program Files (x86)\Arduino\hardware\tools\avr/etc/avrdude.conf -v -patmega328p -carduino -PCOM2 -b115200 -D -Uflash:w:C:\Users\Dragon\AppData\Local\Temp\arduino_build_586725/sketch_feb13a.ino.hex:i
avrdude: Version 6.3-20190619
Copyright (c) 2000-2005 Brian Dean, http://www.bdmicro.com/
Copyright (c) 2007-2014 Joerg Wunsch
System wide configuration file is "C:\Program Files (x86)\Arduino\hardware\tools\avr/etc/avrdude.conf"
Using Port : COM2
Using Programmer : arduino
Overriding Baud Rate : 115200
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 1 of 10: not in sync: resp=0x16
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 2 of 10: not in sync: resp=0x16
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 3 of 10: not in sync: resp=0x16
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 4 of 10: not in sync: resp=0x16
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 5 of 10: not in sync: resp=0x16
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 6 of 10: not in sync: resp=0x16
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 7 of 10: not in sync: resp=0x16
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 8 of 10: not in sync: resp=0x16
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 9 of 10: not in sync: resp=0x16
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 10 of 10: not in sync: resp=0x16
avrdude done. Thank you.
Problem uploading to board. See https://support.arduino.cc/hc/en-us/sections/360003198300 for suggestions.
This report would have more information with
"Show verbose output during compilation"
option enabled in File -> Preferences.
I didn't see it anywhere in Device Manager
Please give a list of everything you have tried, just so we don't ask you to try things again!
Try a different USB port.
Try a different USB cable.
Try a different camputer if you have one.
Tell us if you get the ding-ding when you plug it in, if you do, tell us what is added to the device manager.
Suggests it is not found in the USB system.
This might just help. Maybe.
Thank you
I had a call with someone who I was able to ask about it and they got it working. I'm not certain what they did but it's all set up now
Well, that fixes it. 
Just how, we will never know.
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