Accessing the Import Wizard
To open the Data Import Wizard, click the icon labeled Import that appears when you hover over the list entry Add Content to [space name].

The Import option shown when hovering over Add Content to followed by the space name.
Importing a PNG file
After opening the Data Import Wizard, select Rasters in the left sidebar and then click PNG Raster in the main area. You can then choose files that are already uploaded to your space or upload them directly from your device. To complete the import process, click Import in the bottom-left corner.
If the PNG has a transparent background, that transparency is preserved when the raster is projected onto content.

The PNG Raster import screen in the Data Import Wizard.

The Import option shown when hovering over Add Content to followed by the space name.

Select Rasters (1) in the sidebar and then PNG Raster (2) in the main area.
Select the PNG File
You now have two options to continue the import process:

Choose from Workspace and Upload from Device provide the two file-selection options.
a) Choose from workspace
Clicking this button opens a new window that displays the files uploaded to this space, filtered by file type (in this case .png). Select one or more files you want to import and click Confirm. The selected files will then appear as a list in the main window.

Filtered view of all .png files uploaded in the current space.
b) Upload from device
Selecting this option opens your operating system's file browser. Navigate to the files you want to import and confirm your selection. The selected files will then appear as a list in the main window. Alternatively, you can drag and drop the files directly into the app.

Staging area showing the files selected for import. The delete button on the right removes a file from this view.
Start the Import
Click Import.
A progress bar appears below the Activity Feed while LiquidEarth uploads or processes the file.
After the import has finished, you will be prompted to recalculate the extent of your space so that the content fits properly.

The prompt to recalculate the Space extent after import.
Review the Result in the 3D Workspace

The imported raster in the 3D workspace.
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