We sporadically get this issue. It has happened 22 times in the last 20 days. I also saw other Jenkins tickets for this get resolved with older versions of the plugin. I am using the latest of each plugin and of Jenkins itsself.
The error we get is 

MicrosoftAzureStorage - Container name: <removed by me>MicrosoftAzureStorage - Container name: <removed by me>
MicrosoftAzureStorage - share name: MicrosoftAzureStorage - File path: */upload_folder/
MicrosoftAzureStorage - Virtual path: <removed by me>/
MicrosoftAzureStorage - Exclude path: 
MicrosoftAzureStorage - Uploading files to Microsoft Azure
Uploaded to file storage with uri https://<removed by me>.blob.core.windows.net/<removed by me>/upload_folder/code_version.properties in 00:00:00.081 (HH:mm:ss.S)
Uploaded to file storage with uri https://<removed by me>.blob.core.windows.net/<removed by me>/upload_folder/dev-data.zip in 00:00:00.214 (HH:mm:ss.S)
Uploaded to file storage with uri https://<removed by me>.blob.core.windows.net/removed by me>/upload_folder/<removed by me>.zip 00:00:51.095 (HH:mm:ss.S)
MicrosoftAzureStorage - Need uploaded/archived file count = 4
ERROR: MicrosoftAzureStorage - Error occurred while uploading to Azure - <removed by me>
com.microsoftopentechnologies.windowsazurestorage.exceptions.WAStorageException: Only 3/4 files are successfully uploaded.
     at com.microsoftopentechnologies.windowsazurestorage.service.UploadService.execute(UploadService.java:736)
     at com.microsoftopentechnologies.windowsazurestorage.WAStoragePublisher.perform(WAStoragePublisher.java:438)
     at jenkins.tasks.SimpleBuildStep.perform(SimpleBuildStep.java:123) at org.jenkinsci.plugins.workflow.steps.CoreStep$Execution.run(CoreStep.java:99)
     at org.jenkinsci.plugins.workflow.steps.CoreStep$Execution.run(CoreStep.java:69)
     at org.jenkinsci.plugins.workflow.steps.SynchronousNonBlockingStepExecution.lambda$start$0(SynchronousNonBlockingStepExecution.java:47) 
     at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515) at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
     at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)  
     at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628) at java.base/java.lang.Thread.run(Thread.java:834)

I  have had both Azure and my network team prove this is not latency on client side.