Uploading individual .txt files as individual tasks fails in multiple ways

Describe the bug For the NER usecase when each text file is a separate task; the export of annotated data exports only text file names for text content; even though there is no issues with labelling the content

To Reproduce Steps to reproduce the behavior:

1. Set up NER labelling Task with following Config (I used the valueType=“url” based on recommendation here to have each .txt file as a separate task : https://labelstud.io/guide/tasks.html#Plain-text; it reads “If you want to import entire plain text files without each line becoming a new labeling task, customize the labeling configuration to specify valueType=“url” in the Text tag. See the Text tag documentation”)

  <Labels name="label" toName="text">
    <Label value="label1" background="#FFA39E"/>
    <Label value="label2" background="#D4380D"/>
    <Label value="label3" background="#FFC069"/>
    <Label value="label4" background="#AD8B00"/>
    <Label value="label5" background="#D3F261"/>
    <Label value="label6" background="#389E0D"/>
    <Label value="labe7" background="#5CDBD3"/>
  </Labels>
  <Text name="text" value="$text" valueType="url"/>
</View>

1. Upload a few .txt files and Import as Time Series (only Time Series option keeps the each .txt files as a separate task)
2. Annotate the data
3. Try to Export the annotated data through API or UX and in any format. The annotated data does not contain content of .txt files

Expected behavior

1. The text content is visible in the exported data
2. When uploading .txt files; there is an option to upload it as .txt or .txtl (text or textLine similar to json or jsonl)
3. Perhaps a new valueType param in Text tag to indicate text or textline

Screenshots If applicable, add screenshots to help explain your problem.

Environment (please complete the following information):

• Label Studio Version [e.g. v1.01]

Additional context https://label-studio.slack.com/archives/C01SKFX54QK/p1621488696013000

[dvivarelli]

using last docker build, the workaround with valueType=“url” works

<Text name="text" value="$text" granularity="word" valueType="url"/>

[teebu]

I’m seeing the path not the actual text of my file with 1.6.0rc5

When I choose the other option I get actual data.