Since you cannot configure a function to be triggered by subdirectories. It's only possible to listen to the entire bucket. If you have a trigger based on Bucket, the recommendation is to create a new, separate bucket so that you are not triggered every time a file changes in the Bucket.
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Create a new bucket
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Update your Functions environment config with new bucket name
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Call the functions.config() to get the specified bucket name
You can do environments for Functions:
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$ firebase -P dev functions:config:set storage.bucket="dev-digital-paper-edit"
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> ✔ Functions config updated.
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$ firebase -P dev functions:config:get
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>{
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"storage":{
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"bucket":"dev-digital-paper-edit"
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}
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}
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$ firebase -P prod functions:config:get
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>{}
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And then subsequently in a Function you'd use the config like so:
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const functions =require("firebase-functions");
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const BucketFunctions = functions.storage.object(
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functions.config().storage.bucket
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);
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Caveat
A big caveat here - you don't have a document anywhere in your repo that tells you what this is. You need to be logged in into firebase and run the above