Upload to S3 Content-Type is empty when not using dropdown value on iOS

💬 Mobile
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1

Bumping this since it seems this bug has not been resolved yet.

I am still experiencing issues similar to this and this.

I am uploading images to S3 and want to set the correct Content-Type (image/jpeg, image/png, etc.). Whenever I set a custom value, it does not get stored in S3. Instead, the value is empty. This leads to the images not being displayed properly when accessed via URL.

When I select a value from the dropdown instead (e.g. "Binary"), the value gets stored correctly.

The issues only persists using the native iOS app. I am using Retool Mobile v3.194.0 Build 2182 on iOS 18.7 on an iPhone 13 Pro. When using the IDE or the browser, the value for S3 Content-Type gets stored correctly. I am on Retool self-hosted v3.196.4

I tried the following as a workaround:

  • Set S3 Content-Type to a fixed string, e.g. image/jpeg,
  • Set S3 Content-Type via additional scope,
  • Set S3 Content-Type via variable

None of the above worked for me. I want to avoid sending the images to a workflow that can sets the content type correctly since this would double the distance the data has to travel (device -> Retool hosted -> S3).

Here is my S3 query:

s3-query
s3-query495×270 16.6 KB

This feels like the value of S3 Content-Type gets sanitized against the dropdown values, leading to any other value being ignored.

Thanks for any updates regarding the fix of this issue!

1 Like
3

Hi @goldfoot,

This sounds like a bug. I can file a ticket to our mobile team, unfortunately I can't find any work arounds. It seems that the content-type has to be hard set via dropdown and can't be changed dynamically.

The best work around would be to have two s3 queries, one for each file type, and then you chose the corresponding query when uploading.