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They might be new layers added and then given names to suit their application. Or they might have had other names and got renamed like this: -
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From the Altium documentation:
There are two approaches to interactively change layers during
routing:
Press the * key on the numeric keypad. Each press of that key will move you down to the next available signal layer.
Use the Ctrl+Shift+Wheel Scroll shortcut combination. Hold Ctrl+Shift, then scroll the mouse wheel forwards to move down through
the ...
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So? Name the pads "0", "MH0" (for mounting hole), or something like it. As long as the schematic symbol doesn't have those "0" pins, they will simply be unconnected. We do it like that all the time.
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No, you can't swap DM and DP, it won't work.
SuperSpeed pairs are not routed OK. The wires of a pair are not equal length, it could be better. Typically there would be no ground between wires of a pair.
You can have ground between two pairs if there is enough distance but not really between two wires of a pair.
There are unequal amount of vias, one wire ...
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You need to create a project. You just have two files, one board layout, one schematic, but they are independent and not related to each other.
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Open the various individual libraries in Altium.
Open the your new target library.
Right-click on the component, in the component panel list, that you want to include in your new library, and select 'Copy'.
Right-click in your new library and select 'Paste' in the component list.
This works for both Schematic and PCB libraries.
Going from Eagle to fAultium ...
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It's called "T-Solder" (top) and "B-Solder" (bottom) by default, and you can toggle visibility like any other layer. They're not mechanical layers, they're signal layer pairs, so when you flip a component to the opposite side the solder mask follows.
Here's the top solder mask for a TO-252 in single-layer mode:
And the same part with all ...
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Go to the board then click on Tools >> Reset Error Markers will solve you problem.
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You can paste the Vias on you Pad in circular pattern. Picture is show below.
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