Not compatible with latest flutter version

[rmpt]

Java 17
Kotlin 2.0.20

[Shajk0]

I had the same error, I was able to fix it. I also created a PR but in the meantime you can test my fork to see if it works for you.
https://github.com/Shajk0/document_file_save_plus.git

[Nico04]

You can also use my fork if you prefer, with added support for web
https://github.com/Nico04/document_file_save_plus