I am using Chrome on a MacBook Pro and Tyros 3. This nearly works, there is communication as seen by midi monitor but no files appear in the user style section nor on a usb stick.
Here is the midi monitor data
22:21:18.061 To Digital Workstation Port1 SysEx Yamaha 8 bytes F0 43 50 00 00 07 01 F7
22:21:20.063 To Digital Workstation Port1 SysEx Yamaha 9 bytes F0 43 50 00 00 01 00 00 F7
22:21:20.070 From Digital Workstation Port1 SysEx Yamaha 9 bytes F0 43 50 00 00 01 02 00 F7
22:21:21.063 To Digital Workstation Port1 SysEx Yamaha 9 bytes F0 43 50 00 00 01 00 00 F7
22:21:21.072 From Digital Workstation Port1 SysEx Yamaha 9 bytes F0 43 50 00 00 01 02 00 F7
22:21:22.064 To Digital Workstation Port1 SysEx Yamaha 9 bytes F0 43 50 00 00 01 00 00 F7
22:21:22.074 From Digital Workstation Port1 SysEx Yamaha 9 bytes F0 43 50 00 00 01 02 00 F7
After the first line of the above a message appears in the browser as follows:
! Unexpected error occurred. Please try again. (X)
I hate to say it but maybe the Tyros 3 is just too old.
Just to support my testing: I can send midi song files (.mid) and they play fine on the Tyros 3. To do this I use Qmidi.
Thanks you for your effort and your enthusiasm. Kind regards. Gully