Output of compile: https://pastebin.com/x7yMQGw0
OK , so It built ok , but bombed at upload,
You leave it plugged in? and did the boot button & reset tap?
I see you have Board support package of 2.0.14
I’m using 2.0.8 may not matter though, try roll back and see.
LMK
You have both check marks when the port is there? the board yes (wouldnt comp. with out it)
2.0.14 should work because as I said my second esp32s3 works fine with the exact same setup, yes have have both checkmarks. (this is alt account because I hit reply limit)
Roger that,
I’m thinking maybe the BootLoader is corrupt.
When it’s connected to the IDE as com16 serial monitor is 9600 baud?
does it show at the bottom of the IDE as xiao and com port?
LMK
got to go for 30 mins
no worries, get the serial port to say waiting for download you’ll be there.
HTH
GL 
PJ
If it doesn’t go into flashing mode on platformio, navigate to directory where firmware.bin file is located. For me it was “/home/jonny/projects/esp32_walkie_talkie/esp32_cam_audio_atomic14/.pio/build/seeed_xiao_esp32s3”, so basically replace everything before “/.pio” with the path to your project. Next try uploading sketch manually with esptool.py, so for me the command was “esptool.py --port /dev/ttyACM0 --baud 115200 write_flash 0x1000 ./firmware.bin” (note, my board was on port /dev/ttyACM0). This will solve the refusing to upload problem. So, once it has uploaded manually, you can then flash with platformio upload button. Basically, I think there is some kind of bug which causes the board to refuse to upload (a fatal error occurred: No serial data received), and the manual upload tends to fix the board. The next handful of uploads will work and then you will have to do the manual upload described above if the bug occurs again, and this will fix it for another few uploads, wash, rinse repeat for further bugs.