I had the same problem when loading csv-files. As in https://dev.mysql.com/doc/refman/5.7/en/server-system-variables.html#sysvar_secure_file_priv described, you can only read and write in the path in the variable secure-file-priv.
Therefore you have to include the full path in the query. Since you did not post a concrete query, I can only guess that you tried something like LOAD DATA infile 'temp_0.csv' INTO TABLE series_data_in;. It should work with something like LOAD DATA infile '/var/lib/mysql-files/temp_0.csv' INTO TABLE series_data_in; (or in your case LOAD DATA infile 'C:/ProgramData/MySQL/MySQL\ Server\ 5.7/Uploads/temp_0.csv' INTO TABLE series_data_in ; - be aware of correctly escaped spaces).