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	@wojtek according to https://docs.aws.amazon.com/AmazonS3/latest/dev/BucketRestrictions.html Bucket names can consist only of lowercase letters, numbers, dots (.), and hyphens (-). So the issue is on the server side in AWS extension for HTTP file upload 
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	Attaching problematic file. 
| Type | Bug | 
| Priority | Normal | 
| Assignee | |
| Version | 5.0 | 
| Spent time | 0 | 
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For some reason it's impossible to upload file named
New_Issue_–_YouTrack.png.BeagleIM only gives enigmatic error:
There is nothing relevant in XML logs:
Though I'd say it may be an issue with http-upload component which returns some error on accessing PUT endpoint (or AWS s3 limitation).