I'm not familiar with PGAdmin, but with console you can use a way like
this to insert the contents of a CSV-file into a database table on a
remote host:
cat <file.csv> | ssh <host> "psql -U <user> <database> -c 'copy <table> from stdin;'"
You can do the same from pgAdmin, you just need to upload the file to the server first, then do something like:
COPY table1 FROM '/tmp/file1.txt';
Remember to write the path as the SERVER will see it, not as the client sees it!
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