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OneNote has this: "OneNote can search typed text, handwritten notes, and words that appear in inserted images." https://support.office.com/en-us/article/Search-for-Notes-in...

But it won't help your Linux support issue :(

The last time I tried, OneNote was very slow with this. It took a day or two after saving before my handwritten text would be found by search.

Unfortunately search in images never works for me in OneNote. I have quite a few PDF documents with scanned contracts as images and none of them are found by OneNote or OneDrive search.The content in the images of the PDF files are immediately available in search results on my Google Drive.

If you want to DIY tesseract is open source and does decent OCR. You can even train it yourself.

Dropbox just added this at the end of last year. https://techcrunch.com/2018/10/09/dropbox-finally-adds-autom...

Dropbox feels like they are in the same shitty spot that Evernote is in. They took way too much cash from investors and can't run a great little file-syncing-and-sharing business.