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Diagnose

Cannot connect to Raspberry Pi Zero W

Did you wait several minutes on initial setup boot before trying to connect?
Did you set hostname to raspberrypi.local in Raspberry Pi Imager settings?
Did you enable SSH with password in Raspberry Pi Imager settings?
Did you enter correct WiFi id and password in Raspberry Pi Imager settings?

If any of the settings is incorrect, correct settings and write image again.

Raspberry Pi Zero W not detected as USB stick

Did you connect the usb cable to the usb port and not the power port?
Did you use an usb cable with data support and not only power support?

Automatic dropbox upload not working

Did you enter all settings correctly in config.json?
Check log files:
- cat /home/pi/logs/uploadLogging.log
- cat /home/pi/logs/copyLogging.log
Check for errors on boot:
- sudo dmesg

Manually execute python scripts to investigate

Stop copy and upload system services:

sudo systemctl status usb-copy.service
sudo systemctl stop usb-copy.service
sudo systemctl status usb-copy.service
sudo systemctl status usb-upload.service
sudo systemctl stop usb-upload.service
sudo systemctl status usb-upload.service

Execute scripts manually:

python3 /home/pi/copy_new_usb_files.py
python3 /home/pi/upload_new_files.py

Useful commands for testing

Activate / Deactivate USB mass storage mode:

sudo modprobe -r g_mass_storage
sudo modprobe g_mass_storage file=/piusb.bin stall=0 removable=y ro=0 iSerialNumber=1122334455

Check for rogue process:

sudo top