Merging of imported EPUBs entries with their respective entry from a source

[Palloxin]

Describe your suggested feature

So since it is not possible to backup downloaded chapters (epub export/import excluded) i would like a feature to merge the imported epub to its related novel entry. The advantage of it is that i can preserve the downloaded chapters AND continue to update it in the usual way in case there are new chapters.

Other details

I know i could just keep the two entries separate but when one has more stored the library becomes messy.

This feature if imported has the potential to make the backup include the downloaded chapters using the export, import and "merge" (i prefer syncronization, but whatever)

Acknowledgements

• [X] I have searched the existing issues and this is a new ticket, NOT a duplicate or related to another open or closed issue.
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• [X] I have updated the app to version 1.1.18.
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