Hi @IAmAKnacker !
While there is no native Knack feature to calculate the total size of all files uploaded, you can use validation rules in your File field’s settings to control the size of each individual File record value as seen below in the screenshot. I’m not sure if that will be helpful for your use case at all, but I thought it would be worth sharing.
Here are some forum threads that are discussing similar topics that may have some helpful information for you:
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Option to optimize (reduce size) uploaded PDF files similar to what there is for images
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Passing a Knack object field value to an embedded non-Knack form - #6 by Kelson
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Struggling to Upload Multiples Files in Knack? Not anymore! (View - based)
In the meantime, I have shared this request with our Product team internally for consideration. Thank you for submitting your feature request!