This tutorial will help you if you are having trouble sending attachments with WhatSender.
You may have an attachment issue if any of the following situations occur:
- You cannot send attachments to any contact.
- The attachment is sent to some contacts, but fails with others.
- Messages take too long to send when they include attachments.
- Messages remain pending or fail when you try to send files.
Before continuing, we recommend reviewing this tutorial to confirm that you are following the correct process for sending attachments: how to send attachments.
Before you start: check the advanced settings
Before changing sending times, clearing memory, or modifying other options, check that you have selected the correct option for sending attachments.
Your advanced settings should look like the reference image: in the Select the attachment sending method section, the Backup method option should be enabled.
To check this:
- Open WhatSender.
- Go to the User tab.
- Scroll down to the Advanced settings section.
- Find the option Select the attachment sending method.
- Make sure the Fallback method option is selected.
If this option is not selected, click Reset config.
After resetting the settings, do not change anything else. Try sending a message with an attachment again.
Important: do not enable other advanced settings unless the support team asks you to do so. Changing options such as the old memory system, the old sending system, or the legacy attachment method may cause additional errors.
Solution 1: reduce the file size
The first thing you should do is reduce the size of the file you want to send.
To avoid errors, we recommend that each file is under 2 MB. If the file is larger, WhatSender and WhatsApp Web may take too long to process it. This can cause some messages to remain pending, fail, or take much longer than usual.
If you are sending images, you can compress them using a tool such as TinyPNG: https://tinypng.com/.
If you are sending PDF documents, try compressing them before attaching them.
We do not recommend sending videos directly as attachments, as they are usually heavy and may cause the send to fail or become too slow.
Instead of attaching a video, we recommend uploading it to YouTube in private mode, Google Drive, OneDrive, or another platform, and sharing the link inside the message.
Recommended example: instead of attaching a heavy video, write a short message and add the video link.
Solution 2: adjust the attachment sending time
After reducing the file size, review the time settings in WhatSender.
When you send attachments, WhatsApp Web may need more time to upload and process the file before sending it. If the configured time is too short, some messages may fail, remain pending, or be sent incompletely.
To adjust it:
- Open WhatSender.
- Go to the User tab.
- Find the Preferences section.
- Find the setting related to attachment sending time.
- Increase the attachment sending time to 5 seconds.
- Save the changes if the extension asks you to.
- Run a first test with 10 contacts.
If all messages are sent correctly, you can reduce the time to 4.5 seconds in the next test.
Repeat this process until you find the minimum time that allows your files to be sent without errors.
When you notice that failures appear again, set the time back to the last value where the messages were sent correctly.
Once you have identified the ideal time for your files and connection, we recommend sending in blocks of a maximum of 50 messages.
You can also compress your images or PDFs before sending them. This will help attachments upload faster and reduce sending times.
Important: the higher the configured time, the slower the send will be. However, this can help attachments send correctly.
If messages still fail after adjusting the times, also check that the numbers have the correct prefix. An error in the number format or prefix can make the message fail, even if the attachment is configured correctly.
You can review this tutorial to correct errors related to numbers and prefixes: failed messages: causes and solutions.
Have you been sending attachments for months and now it does not work?
If you were able to send attachments correctly before and the problem suddenly appears now, temporary data from the extension or browser may be causing a conflict.
WhatSender uses information stored in the browser to work correctly. Over time, especially if you send many messages, this data can accumulate and cause errors.
In this case, you can clear WhatSender’s memory.
Solution 3: clear WhatSender’s memory
Before clearing the memory, keep in mind that this action may delete the history saved in the extension.
If you need to keep your reports, download them first from the History tab. You can follow this tutorial to save your reports: History tab and report download.
To clear the memory:
- Open WhatSender.
- Go to the User tab.
- Find the advanced settings section.
- First, click Reset settings.
- Then click Clear memory.
- Close and reopen WhatSender.
- Log in again from the User tab.
- Run a small test with an attachment.
Important: after clearing the memory, your login details may be deleted. That is why you need to log in again with your username and password.
If you do not log in after clearing the memory, your account may be limited and you may have trouble sending messages.
Still need help?
If you still have problems with attachments after following these steps, we can review your case individually.
To help you better, we need you to send us a video showing the problem. Without a visual reference, it is difficult to identify what is going wrong.
In the video, we need to clearly see:
- How you import or copy the contacts into WhatSender. It is important that the numbers are clearly visible.
- How your User tab is configured. Please scroll down so we can see the full configuration, especially the preferences and advanced settings sections.
- How you write and configure the message before sending it.
- How you upload the attachment.
- What type of file you are sending and, if possible, how large it is.
- What happens during the sending process in the History tab. This tab must be open and visible, not minimized.
To record the video, you can use a free tool such as Loom. Here is the tutorial with the instructions: how to send help videos.
Before sending us the video, please review it. If you cannot clearly see the extension, the configuration, the attachment, and the actions you are taking, we will not be able to see them clearly either.
You can also send us the attachment you are trying to use, screenshots if any alert appears, and any additional information that can help us review the case.
Then, send us the video through our contact form: contact support.
Our team will review your case and reply within approximately 1 to 2 business days, Monday to Friday.