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Glide does not support writable array columns in form screens. This means that if you have a column that stores multiple values—such as a multiple files column—you won't be able to update it directly through a form.
Why Doesn't It Work?
Array columns are read-only in forms – Forms are designed for creating new rows, and Glide does not allow writing to array-type columns during this process.
Data Grid Collection Limitations – If you're using the Data Grid Collection component and want to edit data directly, you won't be able to do so within a form screen either.
How to Work Around This?
If you need to update an array column or edit a Data Grid Collection, consider these alternatives:
Use an Edit Screen – Instead of a form, open an Edit Screen, where you can modify existing data, including array columns.
Use Separate Columns – If your goal is to add multiple files, consider using individual file upload fields and later combining them into an array using computed columns.
While forms are great for adding new data, for editing existing complex data types, switching to an Edit Screen is the best approach.