You can’t export assets from Ometria once they’ve been uploaded, so it’s best practice to keep them backed up locally as well.
However, if you need to use an asset outside of Ometria and don’t have a backed up copy, you can use the Get URL feature.
Select the asset you want to copy and select More > Get URL
A URL displays, which you can copy and paste into a new tab in your browser. This can be saved as a .PNG file.