Hi I'm having this issue Where i put my schematica build map But its not showing on My Load schematica

The *.schem schematics are in the Sponge schematic format, which is currently only supported in the 1.12.2 version of Litematica. In the 1.13+ versions your would currently need to use World Edit to paste those and then save with Litematica from that pasted version. See #327