Upload several files and save to database

Your query is not so clear.

Do you want to store the documents into KC and store their docId into Appian? 

Or, are you trying to store the documents directly into the DB? Because file upload fields are not meant for serving this. This allows you store the documents  into Appian KC and later you can store the docId's into the Database.

Are you trying to refer to Blob?

I AM TRYING TO UPLOAD VARIOUS FILES AND THAT THESE FILES ARE SAVED IN MY DATABASE

Try this inside button:

this will create a separate row in database for each file attached

saveInto: {
a!forEach(
items: local!loadedFiles,
expression: {
              a!save(ri!loadedFiles[fv!index].fileAttached, fv!item)
}

}

Try this inside button:

this will create a separate row in database for each file attached

saveInto: {
a!forEach(
items: local!loadedFiles,
expression: {
              a!save(ri!loadedFiles[fv!index].fileAttached, fv!item)
}

}

Thanks! 

But I do not know what to put to replace
local! loadedFiles
fv! index

it would be like this?

 a!fileUploadField(
 label: "Document",
 labelPosition: "ADJACENT",
 /*maxSelections: 1,*/
 value: ri!newDo.docum,
 saveInto:
 {
 a!forEach(
 items: ri!newDo.documentation,
 expression: {
 a!save(ri!newDo.documentation[fv!index].fileAttached, fv!item)
 }
 ),
 ri!newSoli.documentation,
 ri!newDo.docum,
 a!save(ri!newDo.day,now())
 },
 target: cons!C_FLD_document,
 validations: {}
 )

declare a local variable and use it in your fileUploadField control.

code for  file upload field:

a!fileUploadField(
   label: "Document",
   labelPosition: "ABOVE",
   target:cons!C_FLD_document,
   value: local!loadedFiles,
   saveInto: local!loadedFiles,
   validations: {}
)

put the below code in your button saveInto:

saveInto: {
a!forEach(
items: local!loadedFiles,
expression: {
              a!save(ri!loadedFiles[fv!index].fileAttached, fv!item)
}}

-----------------------------------------------------------------

ri!loadedFiles: is your CDT where you are loading the files.

fileAttached: a column in your CDT

How to store a structure multiple file uploaded into DB column and retrieve from DB ? for downloading