split multi polygon vector to separate files in QGIS

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Link for the video showing how to split a multi-polygon vector to separate files in ArcGIS:
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Sir, i have .gpkg file. I have a classified raster too where i want to edit pixels with this .gkpg file. but in SCP plugin it doesnt show the layer (.gpkg) and i cannot convert this file to .shp format as it shows the error: "Feature creation error (OGR error: Attempt to write non-polygon (MULTISURFACE) geometry to POLYGON type shapefile.)
Only 0 of 1 features written.". please help.

ravindrasingh-bnuc