You can find some guidance as to how to upload or edit a model here: /article/uploading-and-editing-models Detailed Question What should you do if you want to contribute a model to the site?
No. The designs and models are all freely available to download. You only need to sign up to the site if you wish to contribute a new model.
Forum discussions are hosted as a Groups.io site here: https://gaugeone3dcircle.groups.io/g/homeWe meet over Zoom every Thursday, alternately at 16.00 and 19.00 London time to allow for folk in different time zones.
The Gauge One 3D circle is a discussion group for railway modellers working to a track gauge of 1 3/4 inches or 45mm who are interested in modern manufacturing technologies.