Firebase: Delete files in Cloud Starage using Cloud Functions - node.js

Question

I'm trying to delete all files, related to some specific entry in Realtime Database, from Cloud Storage on the entry deletion, using Cloud Functions. My functions looks as fallows:
exports.onDeleteRequest = functions.database.ref('/requests/{requestid}/').onDelete(event => {
const storage = functions.config().firebase.storageBucket;
const userId = event.data.previous.child('uid').val();
const requestId = event.params.requestid;
const path = storage + '/photos/' + userId + '/' + requestId;
console.log('path: ', path);
return gcs.bucket(path).delete().then(function() {
console.log("Files removed");
}).catch(function(error) {
console.error("Failed removing files", error);
});
});
But, I continue getting following error in log:
Failed removing files { ApiError: Not Found
at Object.parseHttpRespBody (/user_code/node_modules/#google-cloud/storage/node_modules/#google-cloud/common/src/util.js:192:30)
at Object.handleResp (/user_code/node_modules/#google-cloud/storage/node_modules/#google-cloud/common/src/util.js:132:18)
at /user_code/node_modules/#google-cloud/storage/node_modules/#google-cloud/common/src/util.js:465:12
at Request.onResponse [as _callback] (/user_code/node_modules/#google-cloud/storage/node_modules/retry-request/index.js:182:7)
at Request.self.callback (/user_code/node_modules/#google-cloud/storage/node_modules/request/request.js:186:22)
at emitTwo (events.js:106:13)
at Request.emit (events.js:191:7)
at Request.<anonymous> (/user_code/node_modules/#google-cloud/storage/node_modules/request/request.js:1163:10)
at emitOne (events.js:96:13)
at Request.emit (events.js:188:7)
code: 404,
errors: [ { domain: 'global', reason: 'notFound', message: 'Not Found' } ],
response: undefined,
message: 'Not Found' }
path: photos/gRplE2ujnIb93Ji5HSzEj3O4i3d2/-L-DHkKMhvLH9l6dWmR2
All subfolders are 100% existing at the time of the function execution. Can anyone help?
I apologize for asking the question, that, without a doubt, was asked before in one way or another, but I didn't find any suggestion of how to solve this issue or why does it occurs in the first place.