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I opened up a shapefile ZIP in QGIS. Now, I cannot "toggle editing mode" to on, nor access any of the editing features, anymore! What could I be doing wrong?
Please, and also the one, here-for, this:
Extract it from the zip - zipped shapefiles are read only in QGIS
Difficult to say, but the file might be read-only.
In any case, you can try exporting the layer as a new file - possibly of a different type (like GeoJSON) - and see if you can edit that.