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4

In edit mode. Edit the polygon. Select the polygon using one of selection tools. "Right click the layer -> Export -> Save Selected Features As..." In "Save Vector Layer As..." window, select a file format and path, then save it. Now, you can redo the changes on original polygon.


4

You have a multi-line geometry. You can use the Merge lines algorithm after you have connected the the two parts, so that they form a continuous line. You can also split the multi-geometry into two (simple) geometries using the Multipart to single parts algorithm, join them (using the Vertex Tool in the Digitizing Toolbar) to form a continuous line and ...


3

Another approach if you want an intermediate layer: select the feature you want to edit and do Ctrl + C to copy feature (or "Edit" > "Copy features") do Ctrl + Alt + V (or "Edit" > "Paste features As" > "Temporary Scratch Layer...") edit the scratch layer as you want and right click the layer "Make Permanent" to save (shoter version of right click > "Export"...


3

Your first error may be from using the vertex tool (all vectors) - it may have tried to modify an underlying layer that you did not intend to edit (for example world_map.gpkg in your error message). Your second issue is due to the fact that you cannot perform most edits on KML/KMZ files in QGIS. Even though you can see the yellow pencil enabled which ...


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