Kobo will soon let you upload and sync your own ebooks across devices, for a price

Kobo is launching a new monthly subscription service called Stack that lets you upload your own ebooks and documents to the company's servers where they'll be synced across multiple devices and apps, including your reading progress, highlights, and annotations. Kobo Stack is similar to Amazon's Send to Kindle feature that allows users to upload a wide variety of files to their Kindle libraries…