I've tried Itch.io, newgrounds, scirra arcade, and everytime I upload the HTML5 zipped export from the free version of construct 3 the splash screen shows and then there is just a blank white screen instead of my game.
Is this a common issue or am I just uploading my files incorrectly?
Thank you for your attention,
Develop games in your browser. Powerful, performant & highly capable.
The common thing is for your game to work as intended.
For anything else happening : check for errors in your browser.
See what the console says, and when you then post asking for help you can provide all the informations given by the console to help diagnose what is going on with your game.
An error 404 means that some file is missing from your export.
An error 403 means that a file cannot be accessed/processed and could be a MIME issue.
And so on...