the 257 line of wikisource_uploader need mediawiki syntax change

[tha-uzhavan]

The above mentioned existing line is //line_to_add = "https://" + wiki_url + "/wiki/Index:" + filename//.

If you change as bellow,
"line_to_add = "# [[Index:" + filename"]]

the internal link appears as in the wikisource user's sub page: https://ta.wikisource.org/s/bcbi.

According to wiki syntax, if you use "https://", that is external link (single square bracket). The double square brackets are used for internal links.