What is the problem?
When I drag my *.stl file into the Octoprint screen I receive an error message "Could not upload the file. Make sure it is a valid file with one of these extensions: .g, .gco, .gcode"
*.stl is not on the list
What did you already try to solve it?
serial.log or output on terminal tab, browser error console ...)
octoprint.log (52.1 KB)
Additional information about your setup (OctoPrint version, OctoPi version, printer, firmware, browser, operating system, ...)