Tool ngw_merge_layers (https://toolbox.nextgis.com/t/ngw_merge_layers)
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To test the tool, follow these steps:

 1. Go to Web GIS https://sandbox.nextgis.com/ and log in as administrator, password - demodemo.
 2. Create a resource group using the Create resource button, then Resource group.
 3. Upload the file src.geojson by selecting "Vector layer" in the right panel to your resource group. Get layer ID in Web GIS after uploading.
 4. Write the layer ID in the field "Source Layer id" on the Toolbox page.
 5. Upload the file dst.geojson by selecting "Vector layer" in the right panel to your resource group. Get layer ID in Web GIS after uploading.
 6. Write the layer ID in the field "Destination layer id" on the Toolbox page.
 7. Write value "https://sandbox.nextgis.com" (no quotes) to the field "Source layer Web GIS address".
 8. Write value "administrator" (no quotes) to the field "Source username".
 9. Write value "demodemo" (no quotes) to the field "Source password".
 10. Write value "https://sandbox.nextgis.com" (no quotes) to the field "Target layer Web GIS address".
 11. Write value "administrator" (no quotes) to the field "Target username".
 12. Write value "demodemo" (no quotes) to the field "Target Password".
 13. Run the tool and wait for it to complete.
