SDK v13.0.0 has been released! 
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FileField (Managing files - Uploading files | VIKTOR Documentation)
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EntityOptionField (User input, fields and buttons - Entity selection | VIKTOR Documentation)
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Persistent Storage (Results & visualizations - Storing results | VIKTOR Documentation)
Please keep in mind that this major upgrade requires all deprecations to be resolved. A migration guide can be found here. Feel free to contact us whenever you could need our help!