PS_UploadDataToAppendBlob.ps1

#The below PowerShell script helps append data to the already existing Append blob in the storage account. If the append blob is not present in the storage account, a new Append Blob is created. 

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Connect-AzAccount -Subscription "xxxx"

#set-up the storage account context
$StorageAccountName = "xxx"
$StorageAccountKey = "xxx"
$storageContext = New-AzStorageContext -StorageAccountName $StorageAccountName -StorageAccountKey $StorageAccountKey

#check if the append blob is present in the storage account  
if(Get-AzStorageBlob -Container "xxx" -Context $storageContext -Blob "test.txt")
{
# Get append blob object 
$appendBlob = Get-AzStorageBlob -Container "xxx" -Blob "test1.txt" -Context $storageContext 

#Option 1 : To append data to the blob using a file - Option 1
$appendBlob.ICloudBlob.AppendFromFile("C:\Users\xxx\Desktop\sample.txt")

#Option 2: To append data from a stream 
$f = Get-Item "C:\Users\xxx\Desktop\sample.txt"
$fs = $f.OpenRead()
$appendBlob.ICloudBlob.AppendBlock($fs)
$fs.Close()

}

else
{
#Copy the data to the storage account as append blob
Set-AzStorageBlobContent -File "C:\Users\xxx\Desktop\sample.txt" -Container "xxx" -BlobType Append -Context $storageContext -force -Verbose
}