Test on any device of your choice. Enter a scorm (not downloaded). Click on the "Preview" button. Check when downloading / unzipping, a progress bar is shown (one when downloading and another when unzipping). Please notice that, depending on the device and OS, the unzip bar could not be displayed (some devices aren't able to detect the progress when unzipping). When the scorm is opened, open the table of contents (right top bookmark button). Check it says "Preview mode" at the top. Now go back and use the "Enter" button. When the scorm is opened, open the table of contents (right top bookmark button). Check it does not say "Preview mode" at the top. Now navigate to a SCORM with TOC (ie SCORM-debugger Simple TOC on the master dev testing course). Before entering the scorm it will show a section called "Contents". Click on one of them (different than the first). When the scorm is opened, open the table of contents (right top bookmark button). Check it does not say "Preview mode" at the top. And the selected SCO is the same you clicked on step 11.