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Troubleshooting: schematics
When a schematic won't search or cross-probe, it is usually the PDF itself or a name spelt differently.
"This PDF has no text layer, so names in it cannot be found or cross-probed"
The PDF is a scan. The pages display, but there are no names to find. Look for a text version of the schematic.
Clicking a part on the board doesn't find it on the schematic
The two files may spell the name differently. The schematic's status line offers Link to with the nearest names; pick the right one (Schematics).
"Not matched to a board" on a schematic
Press Use with and the board number to file it under the board in hand.