Importing tab delimited text file using phpPgAdmin 5.1 GUI

Hello Community!
I am trying to use phpPgAdmin  (ver. 5.1 with PHP 5.6.39, server CentOS 7, client Win-10 (Japanese)) to import a tab delimited text file (Excel -> save as tab delimited text;  also used notepad to save the same text file UTF-8 encoding) .
Earlier. I had created a table (no columns have double quotes, not mixed case), for example, like this:
CREATE TABLE spec (rec_id VARCHAR(32)PRIMARY KEY NOT NULL,title_category VARCHAR(255),doc_type VARCHAR(255),etc);
In my tab delimited text file, first row has column names (without "") and starting from second row, data, some with double quotes, some with comma, some with brackets.
When I uploaded the file for the phpPgAdmin to import, I got the following error:
//------------------------------------------------------------------ERROR: column "rec_id" of relation "spec" does not existLINE 1: INSERT INTO "public"."spec" ("rec_id","title_c...//------------------------------------------------------------------
Why that extra "" in the field name? I don't have it in my text file!
How/where can I tell the phpPgAdmin not to add that extra "" around the field name?

Thanks for reading and suggestions.