You can read your memos-text-save-data anytime.
[Notepad Junji] can load old data automaticaly.
Your iOS 11 has [Files App]. Please use it.
In [Browse] - [Locations] - [On My iPhone or iPad] - [Notepad Junji].
[notepad] file is old-data of [Notepad Jobs].
[notepadjunji] file is new-data of [Notepad Junji].
Official Apple Support : Use the Files app on your iPhone, iPad
other way by iTunes with Mac or PC
Official Apple Support : About File Sharing on iPhone, iPad
Always [ Notepad Junji ] [ Notepad Jobs ] save the data to in each device (iPhone, iPad), Not cloud-server-storage.
The each device has each save-data. There is no relation between data.