The option is still the same in Textastic 6. I have attached a screenshot. Make sure to disable "Auto Word Wrap".

Please try to move the file "Symbol List - Heading.tmPreferences" into a subfolder called "Preferences".

I'm actually currently working on an "Open quickly"/"Go to file" feature with sophisticated fuzzy matching which will also include "go to line" functionality. I also hope to add print support, but it's not that easy because I'm using my own completely custom low-level text view.

Can you please try to reboot your device? It can often fix problems with the document picker.

You can use "Open In" to copy a file to another app: http://www.textasticapp.com/v6/manual/lessons/How_can_I_view_an_image_file_or_open_a_file_in_another_app.html

You can also use the Edit button in Textastic, select files and create a ZIP archive: http://www.textasticapp.com/v6/manual/lessons/How_can_I_move__copy_and_rename_files_and_folders.html

Thanks for letting me know. I was not aware of this issue, but I could reproduce it in Textastic 6 on my iPhone.

If you do not need split view multitasking and do not have an iPad Pro or iPhone, Textastic 5 is a great product you bought and it still works perfectly fine.