Unsuccessful SQL dump import in PgAdmin 4 MacOS - sql

Question

I have to use SQL for the very first time. I downloaded data from French Public Service Open Data (https://cerema.app.box.com/v/dvfplus-opendata/folder/160785684885). I also downloaded Postgres App and PgAdmin 4. The file of interest is a dump, with a .sql extension. I created a database called "DVF" directly in PgAdmin.
Following all the tutorials online and the help here I tried to import the file using "Backup" and "Restore" commands, as well as lines directly from the terminal. I have a "success" message when I use Backup or Restore in PgAdmin, but always an error message from the Terminal (by clicking on DVF in Postgres App).
[DVF=# ./psql -U postgres DVF < /Users/Menica/dpts.sql;
>ERROR : syntax error at or near "."
[DVF=# psql -h localhost -p 5432 -U postgres -d DVF -f dpts.sql;
>ERROR: syntax error at or near "psql"
Furthermore, even with "success" messages from Backup/Restore, my tables aren't in PgAdmin after the Refresh.
I don't know if it can help but here are some directories :
The file : /Users/Menica/dpts.sql
PostGres App : /Library/PostgreSQL/9.3
=> There is a lot of folders there, like "bin"
Terminal by default : /bin/zhs
UPDATE
To dump the database I used the following in psql :
DVF-# pg_dump DVF > /Users/Menica/dpts.sql;
ERROR: syntax error at or near "pgdump"
LINE 1: pg_dump DVF > /Users/Menica/dpts.sql
^
The first 25 lines of the dpts.sql file are the following :
--
-- PostgreSQL database dump
--
-- Dumped from database version 9.5.25
-- Dumped by pg_dump version 9.5.25
-- Started on 2022-04-14 15:50:09 CEST
SET statement_timeout = 0;
SET lock_timeout = 0;
SET client_encoding = 'UTF8';
SET standard_conforming_strings = on;
SELECT pg_catalog.set_config('search_path', '', false);
SET check_function_bodies = false;
SET xmloption = content;
SET client_min_messages = warning;
SET row_security = off;
--
-- TOC entry 34 (class 2615 OID 631938251)
-- Name: dvf_d2a; Type: SCHEMA; Schema: -; Owner: -
--
CREATE SCHEMA dvf_d2a;
--
-- TOC entry 35 (class 2615 OID 632173840)
-- Name: dvf_d2b; Type: SCHEMA; Schema: -; Owner: -
--
CREATE SCHEMA dvf_d2b;
SET default_tablespace = '';
SET default_with_oids = false;