This runs entirely inside this browser tab. Nothing is uploaded, nothing is downloaded, and nothing is saved anywhere — your files never leave your computer, and everything disappears the moment you close or reload this tab.
We'll scan for STL, OBJ, 3MF, and G-code files — the first 10 found. Your browser reads them locally to generate thumbnails; none of it is ever sent over the network.
No. When you choose a folder, your browser shows its own standard wording, and some browsers say "Upload" or ask whether to "upload" the files to this site. That's the browser's generic label for letting a web page read files you pick; it doesn't mean anything is sent. The trial reads your files inside this tab, on your computer, to make the thumbnails. No file, file name or folder name is sent to our server or anywhere else, and it's all gone when you close or reload the tab. You can check for yourself: open your browser's developer tools, go to the Network tab, and pick a folder. Nothing is sent.