Fix WOPI Proof Errors by Checking Keys, Discovery, and URLs
Trace Collabora WOPI proof failures to mismatched keys, stale discovery data, clock drift, or proxy URL changes—without weakening validation.
Viber not only allows users to text, call, and video call for free, but it also supports sending and receiving files effortlessly. You can quickly share various file types, including PDFs, DOCs, DOCXs, and XLS formats through the Viber app.
Viber for iOS Viber for Android
Follow the steps below to learn how to send and receive files via Viber:
Note: Downloaded files are typically saved in the Downloads folder within your phone's file management system.


With Viber, you can share files with friends or groups instantly without the need for email or file-sharing websites, making it incredibly convenient!
Wishing you successful file transfers!
Trace Collabora WOPI proof failures to mismatched keys, stale discovery data, clock drift, or proxy URL changes—without weakening validation.
Reset browser zoom, test a clean session, and identify when a malformed size menu needs a Collabora server update.
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Temporarily raise coolwsd to debug, capture one failed open, and use the log sequence to separate WebSocket, WOPI, proxy, and container issues.
Configure the Collabora Online admin login for Docker or Linux, restart the right service, and verify the new password without exposing it.
Find out whether CPU load comes from active documents, idle worker processes, or server capacity before changing Collabora settings or restarting the service.
Check whether Docker is capping Collabora CODE, raise the Compose memory limit safely, and confirm the running container received the new cap.
Simplify Collabora CODE with Compact or Tabbed mode and WOPI PostMessage controls to hide selected buttons, commands, and tabs safely.
Put Nginx in charge of HTTPS for a Collabora CODE container, forward editing WebSockets correctly, and verify the public endpoint without exposing port 9980.
Troubleshoot a mobile browser keyboard covering text in Collabora Online, with quick workarounds and separate checks for browsers, embedded WebViews, and host pages.
Nina CoolCat -
Amazing article! I can’t believe I was wasting time on other apps. Viber rules
Kevin Techie -
What other features should we know about Viber? I feel like I’m just scratching the surface
Pat the Helper -
I didn’t know you could send video files too! This is so versatile!
Olivia Wonder -
I just shared this post with my group. Everyone needs to know about this feature!
Grace Supporter -
This is super helpful! I’ve shared files via WhatsApp, but Viber seems like a better option now.
Emily Tips -
Great insights! I used to feel frustrated trying to share bigger files, but now I can do it with ease
Liz ViberTech -
I’ve been using Viber for years and never knew I could share files this way! Mind-blowing
Vicky Happy -
Fantastic explanation! I’ve been missing out on some cool features of Viber. Will share this with my friends
Alex the Techie -
This is a game changer for my work! Sending documents through Viber is so much faster than email
Anna ShareIt -
Anyone else experience issues while sending big files? I need some help with that
Harry EasyPeasy -
I love how straightforward this guide is! It’s all I needed to get my files shared in no time
Sarah Lee -
I found this guide extremely useful! Sending files via Viber has never been simpler. Thanks for sharing
David QuickHelp -
Anyone knows if the files sent via Viber are saved in any cloud or just locally? Would love some clarification
Julia HelpMe -
Does anyone know if Viber compresses files? I noticed the quality sometimes isn't great
Tommy ViberPro -
I’ve sent files before but never knew about this feature until now. Appreciate the tips
Kathy Cute -
OMG! I didn’t know you could send files so easily through Viber. This just saved me a lot of time!
Scott TechSavvy -
Anyone else having trouble sending very large files? Looking for solutions
Leo PetLover -
Finally, a solid explanation on using Viber for file transfers! I’ve been lost in the app forever
Chloe P -
This made my day! I’m going to try sending my project report via Viber tomorrow
Fiona AllTime -
Loved this article! I was always confused about how to send files effectively. Finally got it
Garry ITExpert -
Great tips! I love how user-friendly Viber is for file sharing now. Makes work-life easier!
Max from London -
The step-by-step format was perfect! I often get lost in tech guides, but this was simple.
Rex the Cat -
LOL, I can finally send cat pics without worrying about quality loss! Thanks, Viber team
Bob the Builder -
This is incredibly helpful! Just tested it out and everything works seamlessly. Cheers
Jill AlwaysHere -
Totally agree with you, Alex! Viber is surprisingly effective for file sharing
Mike G. H. -
This was really helpful! Definitely going to be sharing this with my colleagues. Cheers
Alice Feedback -
I appreciate how thorough this post is. Keep up the great work
Mike 1234 -
Quick question: does the file size matter when using Viber to send files?
John Doe -
This article is super helpful! I’ve always struggled with file sharing on Viber, but now it seems so easy
Patty Sharing -
I appreciate this guide a lot! It’s so straightforward and easy to follow! Gonna try it for work
Chris 87 -
Viber is underrated for file sharing! I appreciate you pointing this out. I’ll be using it more now!
Tim FileGuy -
This was a lifesaver! I can share my designs much faster now. Thank you so much!
Bruce FunGuy -
Yay! I finally figured out how to send files on Viber! This will change my messaging game
Jenny at Home -
Wow, I didn’t know Viber had this capability! Is there a limit to the number of files you can send at once?
Linda Fun -
I just helped my grandma send her first file through Viber! Thanks for the simple instructions
Sam Funny -
What’s next, sharing pizza through Viber? 😂 Thanks for the fun read