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I'm new to QGIS. I don't know how to script in Python, so I'd like to create a model using the graphical modeler tool in QGIS. I would like my model to allow me to fetch directly from a shapefile (different parcel maps, i.e. polygons) to merge them together and make a single map.

Do you know how I can do this, knowing that I've found that "right-click in the work area and select "Add an algorithm" > "General vector" > "Load a vector layer". This will add an algorithm block to your model, but when I right-click in the modeler work area nothing happens.

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I'm not sure I understand you but if you want to be able to select a number of shapefiles and merge them, this should work:

  1. Add a Multiple input parameter with allowed layer type File
  2. Set it as input to Merge vector layers

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