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am i missing something with the `contentType` property? does a `StringAsset` have to be an octet stream?

I don’t think this is related to the `contentType` .  Do you get this error during preview, update, or refresh?

both `preview` and `update`, before the changes are even generated. I removed the `contentType` so that it would default to octet-stream which allowed the preview to generate but then ran into the same error on an actual update

here is the stack trace
```error: Running program '/Users/blah/source/blah/unicode/infra' failed with an unhandled exception:
    Error: Invalid asset encountered when unmarshaling resource property
        at deserializeProperty (/Users/blah/source/blah/unicode/infra/node_modules/@pulumi/azure-native/node_modules/@pulumi/pulumi/runtime/rpc.js:437:31)
        at deserializeProperty (/Users/blah/source/blah/unicode/infra/node_modules/@pulumi/azure-native/node_modules/@pulumi/pulumi/runtime/rpc.js:506:23)
        at deserializeProperty (/Users/blah/source/blah/unicode/infra/node_modules/@pulumi/azure-native/node_modules/@pulumi/pulumi/runtime/rpc.js:463:32)
        at Object.deserializeProperties (/Users/blah/source/blah/unicode/infra/node_modules/@pulumi/azure-native/node_modules/@pulumi/pulumi/runtime/rpc.js:126:24)
        at /Users/blah/source/blah/unicode/infra/node_modules/@pulumi/azure-native/node_modules/@pulumi/pulumi/runtime/resource.js:524:43
        at Generator.next (&lt;anonymous&gt;)
        at /Users/blah/source/blah/unicode/infra/node_modules/@pulumi/azure-native/node_modules/@pulumi/pulumi/runtime/resource.js:21:71
        at new Promise (&lt;anonymous&gt;)
        at __awaiter (/Users/blah/source/blah/unicode/infra/node_modules/@pulumi/azure-native/node_modules/@pulumi/pulumi/runtime/resource.js:17:12)
        at resolveOutputs (/Users/blah/source/blah/unicode/infra/node_modules/@pulumi/azure-native/node_modules/@pulumi/pulumi/runtime/resource.js:519:12)
    error: update failed```

looks like using a `FileAsset` worked. I will open an issue.

<https://github.com/pulumi/pulumi-azure-native/issues/642>